Fix listquote expansion item to handle empty-string input

[users/heiko/exim.git] / doc / doc-docbook / spec.xfpt

diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index 42a84db56b17ae70e477c3fcbe8464fd3f97bcae..2774f6d4db2693d70b0ed2635e245efb01cffcf7 100644 (file)
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -52,7 +52,7 @@
 .set I   "    "
 
 .macro copyyear
 .set I   "    "
 
 .macro copyyear

-2019
+2020

 .endmacro
 
 . /////////////////////////////////////////////////////////////////////////////
 .endmacro
 
 . /////////////////////////////////////////////////////////////////////////////


@@ -3871,6 +3871,14 @@ This option is not intended for use by external callers. It is used internally
 by Exim in conjunction with the &%-MC%& option. It signifies that the
 remote host supports the ESMTP &_DSN_& extension.
 
 by Exim in conjunction with the &%-MC%& option. It signifies that the
 remote host supports the ESMTP &_DSN_& extension.
 

+.new
+.vitem &%-MCd%&
+.oindex "&%-MCd%&"
+This option is not intended for use by external callers. It is used internally
+by Exim in conjunction with the &%-d%& option
+to pass on an information string on the purpose of the process.
+.wen
+

 .vitem &%-MCG%&&~<&'queue&~name'&>
 .oindex "&%-MCG%&"
 This option is not intended for use by external callers. It is used internally
 .vitem &%-MCG%&&~<&'queue&~name'&>
 .oindex "&%-MCG%&"
 This option is not intended for use by external callers. It is used internally


@@ -3902,7 +3910,7 @@ messages through the same SMTP connection.
 .oindex "&%-MCS%&"
 This option is not intended for use by external callers. It is used internally
 by Exim in conjunction with the &%-MC%& option, and passes on the fact that the
 .oindex "&%-MCS%&"
 This option is not intended for use by external callers. It is used internally
 by Exim in conjunction with the &%-MC%& option, and passes on the fact that the

-SMTP SIZE option should be used on messages delivered down the existing
+ESMTP SIZE option should be used on messages delivered down the existing

 connection.
 
 .vitem &%-MCT%&
 connection.
 
 .vitem &%-MCT%&


@@ -5897,13 +5905,13 @@ messages that are submitted by SMTP from local processes using the standard
 input and output (that is, not using TCP/IP). A number of MUAs operate in this
 manner.
 .code
 input and output (that is, not using TCP/IP). A number of MUAs operate in this
 manner.
 .code

-deny    message       = Restricted characters in address
-        domains       = +local_domains
+deny    domains       = +local_domains

         local_parts   = ^[.] : ^.*[@%!/|]
         local_parts   = ^[.] : ^.*[@%!/|]

+        message       = Restricted characters in address

 
 

-deny    message       = Restricted characters in address
-        domains       = !+local_domains
+deny    domains       = !+local_domains

         local_parts   = ^[./|] : ^.*[@%!] : ^.*/\\.\\./
         local_parts   = ^[./|] : ^.*[@%!] : ^.*/\\.\\./

+        message       = Restricted characters in address

 .endd
 These statements are concerned with local parts that contain any of the
 characters &"@"&, &"%"&, &"!"&, &"/"&, &"|"&, or dots in unusual places.
 .endd
 These statements are concerned with local parts that contain any of the
 characters &"@"&, &"%"&, &"!"&, &"/"&, &"|"&, or dots in unusual places.


@@ -6007,10 +6015,10 @@ require verify = recipient
 This statement requires the recipient address to be verified; if verification
 fails, the address is rejected.
 .code
 This statement requires the recipient address to be verified; if verification
 fails, the address is rejected.
 .code

-# deny    message     = rejected because $sender_host_address \
+# deny    dnslists    = black.list.example
+#         message     = rejected because $sender_host_address \

 #                       is in a black list at $dnslist_domain\n\
 #                       $dnslist_text
 #                       is in a black list at $dnslist_domain\n\
 #                       $dnslist_text

-#         dnslists    = black.list.example

 #
 # warn    dnslists    = black.list.example
 #         add_header  = X-Warning: $sender_host_address is in \
 #
 # warn    dnslists    = black.list.example
 #         add_header  = X-Warning: $sender_host_address is in \


@@ -6373,7 +6381,7 @@ All other options are defaulted.
 .code
 local_delivery:
   driver = appendfile
 .code
 local_delivery:
   driver = appendfile

-  file = /var/mail/$local_part_verified
+  file = /var/mail/$local_part_data

   delivery_date_add
   envelope_to_add
   return_path_add
   delivery_date_add
   envelope_to_add
   return_path_add


@@ -6386,7 +6394,7 @@ traditional BSD mailbox format.
 .new
 We prefer to avoid using &$local_part$& directly to define the mailbox filename,
 as it is provided by a potential bad actor.
 .new
 We prefer to avoid using &$local_part$& directly to define the mailbox filename,
 as it is provided by a potential bad actor.

-Instead we use &$local_part_verified$&,
+Instead we use &$local_part_data$&,

 the result of looking up &$local_part$& in the user database
 (done by using &%check_local_user%& in the the router).
 .wen
 the result of looking up &$local_part$& in the user database
 (done by using &%check_local_user%& in the the router).
 .wen


@@ -6633,6 +6641,8 @@ file that is searched could contain lines like this:
 .endd
 When the lookup succeeds, the result of the expansion is a list of domains (and
 possibly other types of item that are allowed in domain lists).
 .endd
 When the lookup succeeds, the result of the expansion is a list of domains (and
 possibly other types of item that are allowed in domain lists).

+.cindex "tainted data" "de-tainting"
+The result of the expansion is not tainted.

 
 In the second example, the lookup is a single item in a domain list. It causes
 Exim to use a lookup to see if the domain that is being processed can be found
 
 In the second example, the lookup is a single item in a domain list. It causes
 Exim to use a lookup to see if the domain that is being processed can be found


@@ -6653,6 +6663,13 @@ If the value of &$sender_host_address$& is 192.168.5.6, expansion of the
 first &%domains%& setting above generates the second setting, which therefore
 causes a second lookup to occur.
 
 first &%domains%& setting above generates the second setting, which therefore
 causes a second lookup to occur.
 

+.new
+The lookup type may optionally be followed by a comma
+and a comma-separated list of options.
+Each option is a &"name=value"& pair.
+Whether an option is meaningful depands on the lookup type.
+.wen
+

 The rest of this chapter describes the different lookup types that are
 available. Any of them can be used in any part of the configuration where a
 lookup is permitted.
 The rest of this chapter describes the different lookup types that are
 available. Any of them can be used in any part of the configuration where a
 lookup is permitted.


@@ -6667,6 +6684,17 @@ Two different types of data lookup are implemented:
 The &'single-key'& type requires the specification of a file in which to look,
 and a single key to search for. The key must be a non-empty string for the
 lookup to succeed. The lookup type determines how the file is searched.
 The &'single-key'& type requires the specification of a file in which to look,
 and a single key to search for. The key must be a non-empty string for the
 lookup to succeed. The lookup type determines how the file is searched.

+.new
+.cindex "tainted data" "single-key lookups"
+The file string may not be tainted
+
+.cindex "tainted data" "de-tainting"
+All single-key lookups support the option &"ret=key"&.
+If this is given and the lookup
+(either underlying implementation or cached value)
+returns data, the result is replaced with a non-tainted
+version of the lookup key.
+.wen

 .next
 .cindex "query-style lookup" "definition of"
 The &'query-style'& type accepts a generalized database query. No particular
 .next
 .cindex "query-style lookup" "definition of"
 The &'query-style'& type accepts a generalized database query. No particular


@@ -6758,11 +6786,42 @@ by default, but has an option to omit them (see section &<<SECTdbmbuild>>&).
 .next
 .cindex "lookup" "dsearch"
 .cindex "dsearch lookup type"
 .next
 .cindex "lookup" "dsearch"
 .cindex "dsearch lookup type"

-&(dsearch)&: The given file must be a directory; this is searched for an entry
-whose name is the key by calling the &[lstat()]& function. The key may not
-contain any forward slash characters. If &[lstat()]& succeeds, the result of
-the lookup is the name of the entry, which may be a file, directory,
-symbolic link, or any other kind of directory entry. An example of how this
+&(dsearch)&: The given file must be an
+.new
+absolute
+.wen
+directory path; this is searched for an entry
+whose name is the key by calling the &[lstat()]& function.
+The key may not
+contain any forward slash characters.
+If &[lstat()]& succeeds then so does the lookup.
+.new
+.cindex "tainted data" "dsearch result"
+The result is regarded as untainted.
+
+Options for the lookup can be given by appending them after the word "dsearch",
+separated by a comma.  Options, if present, are a comma-separated list having
+each element starting with a tag name and an equals.
+
+Two options are supported, for the return value and for filtering match
+candidates.
+The "ret" option requests an alternate result value of
+the entire path for the entry. Example:
+.code
+${lookup {passwd} dsearch,ret=full {/etc}}
+.endd
+The default result is just the requested entry.
+The "filter" option requests that only directory entries of a given type
+are matched. The match value is one of "file", "dir" or "subdir" (the latter
+not matching "." or ".."). Example:
+.code
+${lookup {passwd} dsearch,filter=file {/etc}}
+.endd
+The default matching is for any entry type, including directories
+and symlinks.
+.wen
+
+An example of how this

 lookup can be used to support virtual domains is given in section
 &<<SECTvirtualdomains>>&.
 .next
 lookup can be used to support virtual domains is given in section
 &<<SECTvirtualdomains>>&.
 .next


@@ -6810,7 +6869,7 @@ If a selector is numeric, it must apply to a JSON array; the (zero-based)
 nunbered array element is selected.
 Otherwise it must apply to a JSON object; the named element is selected.
 The final resulting element can be a simple JSON type or a JSON object
 nunbered array element is selected.
 Otherwise it must apply to a JSON object; the named element is selected.
 The final resulting element can be a simple JSON type or a JSON object

-or array; for the latter two a string-representation os the JSON
+or array; for the latter two a string-representation of the JSON

 is returned.
 For elements of type string, the returned value is de-quoted.
 .next
 is returned.
 For elements of type string, the returned value is de-quoted.
 .next


@@ -6934,9 +6993,10 @@ be followed by optional colons.
 lookup types support only literal keys.
 
 .next
 lookup types support only literal keys.
 
 .next

+.cindex "spf lookup type"

 .cindex "lookup" "spf"
 .cindex "lookup" "spf"

-If Exim is built with SPF support, manual lookups can be done
-(as opposed to the standard ACL condition method.
+&(spf)&: If Exim is built with SPF support, manual lookups can be done
+(as opposed to the standard ACL condition method).

 For details see section &<<SECSPF>>&.
 .endlist ilist
 
 For details see section &<<SECSPF>>&.
 .endlist ilist
 


@@ -7007,7 +7067,11 @@ passed to a Redis database. See section &<<SECTsql>>&.
 .next
 .cindex "sqlite lookup type"
 .cindex "lookup" "sqlite"
 .next
 .cindex "sqlite lookup type"
 .cindex "lookup" "sqlite"

-&(sqlite)&: The format of the query is a filename followed by an SQL statement
+&(sqlite)&: The format of the query is
+new
+an optional filename
+.wen
+followed by an SQL statement

 that is passed to an SQLite database. See section &<<SECTsqlite>>&.
 
 .next
 that is passed to an SQLite database. See section &<<SECTsqlite>>&.
 
 .next


@@ -7914,6 +7978,11 @@ If any MySQL, PostgreSQL, Oracle, InterBase or Redis lookups are used, the
 or &%redis_servers%&
 option (as appropriate) must be set to a colon-separated list of server
 information.
 or &%redis_servers%&
 option (as appropriate) must be set to a colon-separated list of server
 information.

+.oindex &%mysql_servers%&
+.oindex &%pgsql_servers%&
+.oindex &%oracle_servers%&
+.oindex &%ibase_servers%&
+.oindex &%redis_servers%&

 (For MySQL and PostgreSQL, the global option need not be set if all
 queries contain their own server information &-- see section
 &<<SECTspeserque>>&.)
 (For MySQL and PostgreSQL, the global option need not be set if all
 queries contain their own server information &-- see section
 &<<SECTspeserque>>&.)


@@ -7964,12 +8033,14 @@ The &%quote_redis%& expansion operator
 escapes whitespace and backslash characters with a backslash.
 
 .section "Specifying the server in the query" "SECTspeserque"
 escapes whitespace and backslash characters with a backslash.
 
 .section "Specifying the server in the query" "SECTspeserque"

+.new

 For MySQL, PostgreSQL and Redis lookups (but not currently for Oracle and InterBase),
 it is possible to specify a list of servers with an individual query. This is
 For MySQL, PostgreSQL and Redis lookups (but not currently for Oracle and InterBase),
 it is possible to specify a list of servers with an individual query. This is

-done by starting the query with
+done by appending a comma-separated option to the query type:

 .display
 .display

-&`servers=`&&'server1:server2:server3:...'&&`;`&

 .endd
 .endd

+&`,servers=`&&'server1:server2:server3:...'&
+.wen

 Each item in the list may take one of two forms:
 .olist
 If it contains no slashes it is assumed to be just a host name. The appropriate
 Each item in the list may take one of two forms:
 .olist
 If it contains no slashes it is assumed to be just a host name. The appropriate


@@ -7994,15 +8065,26 @@ mysql_servers = slave1/db/name/pw:\
 .endd
 In an updating lookup, you could then write:
 .code
 .endd
 In an updating lookup, you could then write:
 .code

-${lookup mysql{servers=master; UPDATE ...} }
+${lookup mysql,servers=master {UPDATE ...} }

 .endd
 That query would then be sent only to the master server. If, on the other hand,
 the master is not to be used for reading, and so is not present in the global
 option, you can still update it by a query of this form:
 .code
 .endd
 That query would then be sent only to the master server. If, on the other hand,
 the master is not to be used for reading, and so is not present in the global
 option, you can still update it by a query of this form:
 .code

-${lookup pgsql{servers=master/db/name/pw; UPDATE ...} }
+${lookup pgsql,servers=master/db/name/pw {UPDATE ...} }

 .endd
 
 .endd
 

+.new
+An older syntax places the servers speciification before the qury,
+semicolon separated:
+.code
+${lookup mysql{servers=master; UPDATE ...} }
+.endd
+The new version avoids potential issues with tainted
+arguments in the query, for explicit expansion.
+&*Note*&: server specifications in list-style lookups are still problematic.
+.wen
+

 
 .section "Special MySQL features" "SECID73"
 For MySQL, an empty host name or the use of &"localhost"& in &%mysql_servers%&
 
 .section "Special MySQL features" "SECID73"
 For MySQL, an empty host name or the use of &"localhost"& in &%mysql_servers%&


@@ -8051,19 +8133,35 @@ affected.
 .cindex "sqlite lookup type"
 SQLite is different to the other SQL lookups because a filename is required in
 addition to the SQL query. An SQLite database is a single file, and there is no
 .cindex "sqlite lookup type"
 SQLite is different to the other SQL lookups because a filename is required in
 addition to the SQL query. An SQLite database is a single file, and there is no

-daemon as in the other SQL databases. The interface to Exim requires the name
-of the file, as an absolute path, to be given at the start of the query. It is
-separated from the query by white space. This means that the path name cannot
-contain white space. Here is a lookup expansion example:
+daemon as in the other SQL databases.
+
+.new
+.oindex &%sqlite_dbfile%&
+The preferred way of specifying the file is by using the
+&%sqlite_dbfile%& option, set to
+an absolute path.
+.wen
+A deprecated method is available, prefixing the query with the filename
+separated by white space.
+This means that the path name cannot contain white space.
+.cindex "tainted data" "sqlite file"
+It also means that the query cannot use any tainted values, as that taints
+the entire query including the filename - resulting in a refusal to open
+the file.
+
+.new
+Here is a lookup expansion example:

 .code
 .code

-${lookup sqlite {/some/thing/sqlitedb \
-  select name from aliases where id='userx';}}
+sqlite_dbfile = /some/thing/sqlitedb
+...
+${lookup sqlite {select name from aliases where id='userx';}}

 .endd
 In a list, the syntax is similar. For example:
 .code
 .endd
 In a list, the syntax is similar. For example:
 .code

-domainlist relay_to_domains = sqlite;/some/thing/sqlitedb \
+domainlist relay_to_domains = sqlite;\

    select * from relays where ip='$sender_host_address';
 .endd
    select * from relays where ip='$sender_host_address';
 .endd

+.wen

 The only character affected by the &%quote_sqlite%& operator is a single
 quote, which it doubles.
 
 The only character affected by the &%quote_sqlite%& operator is a single
 quote, which it doubles.
 


@@ -8253,6 +8351,35 @@ in the previous section. You could also use the &(wildlsearch)& or
 
 
 
 
 
 

+.new
+.section "Results of list checking" SECTlistresults
+The primary result of doing a list check is a truth value.
+In some contexts additional information is stored
+about the list element that matched:
+.vlist
+.vitem hosts
+A &%hosts%& ACL condition
+will store a result in the &$host_data$& variable.
+.vitem local_parts
+A &%local_parts%& router option or &%local_parts%& ACL condition
+will store a result in the &$local_part_data$& variable.
+.vitem domains
+A &%domains%& router option or &%domains%& ACL condition
+.vitem senders
+A &%senders%& router option or &%senders%& ACL condition
+will store a result in the &$sender_data$& variable.
+.vitem recipients
+A &%recipients%& ACL condition
+will store a result in the &$recipient_data$& variable.
+.endlist
+
+The detail of the additional information depends on the
+type of match and is given below as the &*value*& information.
+.wen
+
+
+
+

 .section "Named lists" "SECTnamedlists"
 .cindex "named lists"
 .cindex "list" "named"
 .section "Named lists" "SECTnamedlists"
 .cindex "named lists"
 .cindex "list" "named"


@@ -8415,6 +8542,12 @@ If a pattern consists of a single @ character, it matches the local host name,
 as set by the &%primary_hostname%& option (or defaulted). This makes it
 possible to use the same configuration file on several different hosts that
 differ only in their names.
 as set by the &%primary_hostname%& option (or defaulted). This makes it
 possible to use the same configuration file on several different hosts that
 differ only in their names.

+
+.new
+The value for a match will be the primary host name.
+.wen
+
+

 .next
 .cindex "@[] in a domain list"
 .cindex "domain list" "matching local IP interfaces"
 .next
 .cindex "@[] in a domain list"
 .cindex "domain list" "matching local IP interfaces"


@@ -8424,7 +8557,14 @@ in square brackets (as in an email address that contains a domain literal), but
 only if that IP address is recognized as local for email routing purposes. The
 &%local_interfaces%& and &%extra_local_interfaces%& options can be used to
 control which of a host's several IP addresses are treated as local.
 only if that IP address is recognized as local for email routing purposes. The
 &%local_interfaces%& and &%extra_local_interfaces%& options can be used to
 control which of a host's several IP addresses are treated as local.

-In today's Internet, the use of domain literals is controversial.
+In today's Internet, the use of domain literals is controversial;
+see the &%allow_domain_literals%& main option.
+
+.new
+The value for a match will be the string &`@[]`&.
+.wen
+
+

 .next
 .cindex "@mx_any"
 .cindex "@mx_primary"
 .next
 .cindex "@mx_any"
 .cindex "@mx_primary"


@@ -8473,6 +8613,11 @@ involved, it is easiest to change the delimiter for the main list as well:
 domains = <? @mx_any/ignore=<;127.0.0.1;::1 ? \
           an.other.domain ? ...
 .endd
 domains = <? @mx_any/ignore=<;127.0.0.1;::1 ? \
           an.other.domain ? ...
 .endd

+.new
+The value for a match will be the list element string (starting &`@mx_`&).
+.wen
+
+

 .next
 .cindex "asterisk" "in domain list"
 .cindex "domain list" "asterisk in"
 .next
 .cindex "asterisk" "in domain list"
 .cindex "domain list" "asterisk in"


@@ -8485,6 +8630,12 @@ matching works only in terms of dot-separated components. For example, a domain
 list item such as &`*key.ex`& matches &'donkey.ex'& as well as
 &'cipher.key.ex'&.
 
 list item such as &`*key.ex`& matches &'donkey.ex'& as well as
 &'cipher.key.ex'&.
 

+.new
+The value for a match will be the list element string (starting with the asterisk).
+Additionally, &$0$& will be set to the matched string
+and &$1$& to the variable portion which the asterisk matched.
+.wen
+

 .next
 .cindex "regular expressions" "in domain list"
 .cindex "domain list" "matching regular expression"
 .next
 .cindex "regular expressions" "in domain list"
 .cindex "domain list" "matching regular expression"


@@ -8501,6 +8652,15 @@ must escape any backslash and dollar characters in the regular expression, or
 use the special &`\N`& sequence (see chapter &<<CHAPexpand>>&) to specify that
 it is not to be expanded (unless you really do want to build a regular
 expression by expansion, of course).
 use the special &`\N`& sequence (see chapter &<<CHAPexpand>>&) to specify that
 it is not to be expanded (unless you really do want to build a regular
 expression by expansion, of course).

+
+.new
+The value for a match will be the list element string (starting with the circumflex).
+Additionally, &$0$& will be set to the string matching the regular expression,
+and &$1$& (onwards) to any submatches identified by parentheses.
+.wen
+
+
+

 .next
 .cindex "lookup" "in domain list"
 .cindex "domain list" "matching by lookup"
 .next
 .cindex "lookup" "in domain list"
 .cindex "domain list" "matching by lookup"


@@ -8512,12 +8672,15 @@ must be a filename in a suitable format for the lookup type. For example, for
 domains = cdb;/etc/mail/local_domains.cdb
 .endd
 The appropriate type of lookup is done on the file using the domain name as the
 domains = cdb;/etc/mail/local_domains.cdb
 .endd
 The appropriate type of lookup is done on the file using the domain name as the

-key. In most cases, the data that is looked up is not used; Exim is interested
+key. In most cases, the value resulting from the lookup is not used; Exim is interested

 only in whether or not the key is present in the file. However, when a lookup
 is used for the &%domains%& option on a router
 only in whether or not the key is present in the file. However, when a lookup
 is used for the &%domains%& option on a router

-or a &%domains%& condition in an ACL statement, the data is preserved in the
+or a &%domains%& condition in an ACL statement, the value is preserved in the

 &$domain_data$& variable and can be referred to in other router options or
 other statements in the same ACL.
 &$domain_data$& variable and can be referred to in other router options or
 other statements in the same ACL.

+.cindex "tainted data" "de-tainting"
+The value will be untainted.
+

 
 .next
 Any of the single-key lookup type names may be preceded by
 
 .next
 Any of the single-key lookup type names may be preceded by


@@ -8536,6 +8699,7 @@ original lookup fails. This is not a useful feature when using a domain list to
 select particular domains (because any domain would match), but it might have
 value if the result of the lookup is being used via the &$domain_data$&
 expansion variable.
 select particular domains (because any domain would match), but it might have
 value if the result of the lookup is being used via the &$domain_data$&
 expansion variable.

+

 .next
 If the pattern starts with the name of a query-style lookup type followed by a
 semicolon (for example, &"nisplus;"& or &"ldap;"&), the remainder of the
 .next
 If the pattern starts with the name of a query-style lookup type followed by a
 semicolon (for example, &"nisplus;"& or &"ldap;"&), the remainder of the


@@ -8545,17 +8709,37 @@ chapter &<<CHAPfdlookup>>&. For example:
 hold_domains = mysql;select domain from holdlist \
   where domain = '${quote_mysql:$domain}';
 .endd
 hold_domains = mysql;select domain from holdlist \
   where domain = '${quote_mysql:$domain}';
 .endd

-In most cases, the data that is looked up is not used (so for an SQL query, for
+In most cases, the value resulting from the lookup is not used (so for an SQL query, for

 example, it doesn't matter what field you select). Exim is interested only in
 whether or not the query succeeds. However, when a lookup is used for the
 example, it doesn't matter what field you select). Exim is interested only in
 whether or not the query succeeds. However, when a lookup is used for the

-&%domains%& option on a router, the data is preserved in the &$domain_data$&
+&%domains%& option on a router, the value is preserved in the &$domain_data$&

 variable and can be referred to in other options.
 variable and can be referred to in other options.

+.cindex "tainted data" "de-tainting"
+The value will be untainted.
+
+.next
+.new
+If the pattern starts with the name of a lookup type
+of either kind (single-key or query-style) it may be
+followed by a comma and options,
+The options are lookup-type specific and consist of a comma-separated list.
+Each item starts with a tag and and equals "=".
+.wen
+

 .next
 .cindex "domain list" "matching literal domain name"
 If none of the above cases apply, a caseless textual comparison is made
 between the pattern and the domain.
 .next
 .cindex "domain list" "matching literal domain name"
 If none of the above cases apply, a caseless textual comparison is made
 between the pattern and the domain.

+
+The value for a match will be the list element string.
+.cindex "tainted data" "de-tainting"
+Note that this is commonly untainted
+(depending on the way the list was created).
+This is a useful way of obtaining an untainted equivalent to
+the domain, for later operations.

 .endlist
 
 .endlist
 

+

 Here is an example that uses several different kinds of pattern:
 .code
 domainlist funny_domains = \
 Here is an example that uses several different kinds of pattern:
 .code
 domainlist funny_domains = \


@@ -10196,21 +10380,37 @@ ${readsocket{/socket/name}{request string}{3s}}
 .endd
 
 The third argument is a list of options, of which the first element is the timeout
 .endd
 
 The third argument is a list of options, of which the first element is the timeout

-and must be present if the argument is given.
+and must be present if any options are given.

 Further elements are options of form &'name=value'&.
 Further elements are options of form &'name=value'&.

-Two option types is currently recognised: shutdown and tls.
-The first defines whether (the default)
-or not a shutdown is done on the connection after sending the request.
-Example, to not do so (preferred, eg. by some webservers):
+Example:

 .code
 ${readsocket{/socket/name}{request string}{3s:shutdown=no}}
 .endd
 .code
 ${readsocket{/socket/name}{request string}{3s:shutdown=no}}
 .endd

-The second, tls, controls the use of TLS on the connection.  Example:
-.code
-${readsocket{/socket/name}{request string}{3s:tls=yes}}
-.endd
-The default is to not use TLS.
+
+.new
+The following option names are recognised:
+.ilist
+&*cache*&
+Defines if the result data can be cached for use by a later identical
+request in the same process.
+Values are &"yes"& or &"no"& (the default).
+If not, all cached results for this connection specification
+will be invalidated.
+
+.next
+&*shutdown*&
+Defines whether or not a write-shutdown is done on the connection after
+sending the request. Values are &"yes"& (the default) or &"no"&
+(preferred, eg. by some webservers).
+
+.next
+&*tls*&
+Controls the use of TLS on the connection.
+Values are &"yes"& or &"no"& (the default).

 If it is enabled, a shutdown as descripbed above is never done.
 If it is enabled, a shutdown as descripbed above is never done.

+.endlist
+.wen
+

 
 A fourth argument allows you to change any newlines that are in the data
 that is read, in the same way as for &%readfile%& (see above). This example
 
 A fourth argument allows you to change any newlines that are in the data
 that is read, in the same way as for &%readfile%& (see above). This example


@@ -10685,8 +10885,7 @@ a decimal representation of the answer (without &"K"&, &"M"& or &"G"&). For exam
 
 As a more realistic example, in an ACL you might have
 .code
 
 As a more realistic example, in an ACL you might have
 .code

-deny   message = Too many bad recipients
-       condition =                    \
+deny   condition =                    \

          ${if and {                   \
            {>{$rcpt_count}{10}}       \
            {                          \
          ${if and {                   \
            {>{$rcpt_count}{10}}       \
            {                          \


@@ -10695,6 +10894,7 @@ deny   message = Too many bad recipients
              {${eval:$rcpt_count/2}}  \
            }                          \
          }{yes}{no}}
              {${eval:$rcpt_count/2}}  \
            }                          \
          }{yes}{no}}

+       message = Too many bad recipients

 .endd
 The condition is true if there have been more than 10 RCPT commands and
 fewer than half of them have resulted in a valid recipient.
 .endd
 The condition is true if there have been more than 10 RCPT commands and
 fewer than half of them have resulted in a valid recipient.


@@ -12125,13 +12325,6 @@ contain the trailing slash. If &$config_file$& does not contain a slash,
 .vindex "&$config_file$&"
 The name of the main configuration file Exim is using.
 
 .vindex "&$config_file$&"
 The name of the main configuration file Exim is using.
 

-.vitem &$dmarc_domain_policy$& &&&
-       &$dmarc_status$& &&&
-       &$dmarc_status_text$& &&&
-       &$dmarc_used_domains$&
-Results of DMARC verification.
-For details see section &<<SECDMARC>>&.
-

 .vitem &$dkim_verify_status$&
 Results of DKIM verification.
 For details see section &<<SECDKIMVFY>>&.
 .vitem &$dkim_verify_status$&
 Results of DKIM verification.
 For details see section &<<SECDKIMVFY>>&.


@@ -12164,6 +12357,13 @@ When a message has been received this variable contains
 a colon-separated list of signer domains and identities for the message.
 For details see section &<<SECDKIMVFY>>&.
 
 a colon-separated list of signer domains and identities for the message.
 For details see section &<<SECDKIMVFY>>&.
 

+.vitem &$dmarc_domain_policy$& &&&
+       &$dmarc_status$& &&&
+       &$dmarc_status_text$& &&&
+       &$dmarc_used_domains$&
+Results of DMARC verification.
+For details see section &<<SECDMARC>>&.
+

 .vitem &$dnslist_domain$& &&&
        &$dnslist_matched$& &&&
        &$dnslist_text$& &&&
 .vitem &$dnslist_domain$& &&&
        &$dnslist_matched$& &&&
        &$dnslist_text$& &&&


@@ -12236,7 +12436,9 @@ the complete argument of the ETRN command (see section &<<SECTETRN>>&).
 .cindex "tainted data"
 If the origin of the data is an incoming message,
 the result of expanding this variable is tainted.
 .cindex "tainted data"
 If the origin of the data is an incoming message,
 the result of expanding this variable is tainted.

-See also &$domain_verified$&.
+When un untainted version is needed, one should be obtained from
+looking up the value in a local (therefore trusted) database.
+Often &$domain_data$& is usable in this role.

 .wen
 
 
 .wen
 
 


@@ -12333,7 +12535,7 @@ result of the lookup is made available in the &$host_data$& variable. This
 allows you, for example, to do things like this:
 .code
 deny  hosts = net-lsearch;/some/file
 allows you, for example, to do things like this:
 .code
 deny  hosts = net-lsearch;/some/file

-message = $host_data
+      message = $host_data

 .endd
 .vitem &$host_lookup_deferred$&
 .cindex "host name" "lookup, failure of"
 .endd
 .vitem &$host_lookup_deferred$&
 .cindex "host name" "lookup, failure of"


@@ -12443,29 +12645,15 @@ Consider carefully the implications of using it unvalidated as a name
 for file access.
 This presents issues for users' &_.forward_& and filter files.
 For traditional full user accounts, use &%check_local_users%& and the
 for file access.
 This presents issues for users' &_.forward_& and filter files.
 For traditional full user accounts, use &%check_local_users%& and the

-&$local_part_verified$& variable rather than this one.
+&$local_part_data$& variable rather than this one.

 For virtual users, store a suitable pathname component in the database
 which is used for account name validation, and use that retrieved value
 rather than this variable.
 For virtual users, store a suitable pathname component in the database
 which is used for account name validation, and use that retrieved value
 rather than this variable.

+Often &$local_part_data$& is usable in this role.

 If needed, use a router &%address_data%& or &%set%& option for
 the retrieved data.
 .wen
 
 If needed, use a router &%address_data%& or &%set%& option for
 the retrieved data.
 .wen
 

-.vindex "&$local_part_prefix$&"
-.vindex "&$local_part_prefix_v$&"
-.vindex "&$local_part_suffix$&"
-.vindex "&$local_part_suffix_v$&"
-.cindex affix variables
-If a local part prefix or suffix has been recognized, it is not included in the
-value of &$local_part$& during routing and subsequent delivery. The values of
-any prefix or suffix are in &$local_part_prefix$& and
-&$local_part_suffix$&, respectively.
-.new
-If the affix specification included a wildcard then the portion of
-the affix matched by the wildcard is in
-&$local_part_prefix_v$& or &$local_part_suffix_v$& as appropriate.
-.wen
-

 When a message is being delivered to a file, pipe, or autoreply transport as a
 result of aliasing or forwarding, &$local_part$& is set to the local part of
 the parent address, not to the filename or command (see &$address_file$& and
 When a message is being delivered to a file, pipe, or autoreply transport as a
 result of aliasing or forwarding, &$local_part$& is set to the local part of
 the parent address, not to the filename or command (see &$address_file$& and


@@ -12506,44 +12694,33 @@ router as &$local_part_data$&. In addition, if the driver routes the address
 to a transport, the value is available in that transport. If the transport is
 handling multiple addresses, the value from the first address is used.
 
 to a transport, the value is available in that transport. If the transport is
 handling multiple addresses, the value from the first address is used.
 

+.new
+The &%check_local_user%& router option also sets this variable.
+.wen
+

 &$local_part_data$& is also set when the &%local_parts%& condition in an ACL
 matches a local part by means of a lookup. The data read by the lookup is
 available during the rest of the ACL statement. In all other situations, this
 variable expands to nothing.
 
 &$local_part_data$& is also set when the &%local_parts%& condition in an ACL
 matches a local part by means of a lookup. The data read by the lookup is
 available during the rest of the ACL statement. In all other situations, this
 variable expands to nothing.
 

-.vitem &$local_part_prefix$&
-.vindex "&$local_part_prefix$&"
+.vindex &$local_part_prefix$& &&&
+       &$local_part_prefix_v$& &&&
+       &$local_part_suffix$& &&&
+       &$local_part_suffix_v$&

 .cindex affix variables
 .cindex affix variables

-When an address is being routed or delivered, and a
-specific prefix for the local part was recognized, it is available in this
-variable, having been removed from &$local_part$&.
-
-.new
-.vitem &$local_part_prefix_v$&
-.vindex "&$local_part_prefix_v$&"
-When &$local_part_prefix$& is valid and the prefix match used a wildcard,
-the portion matching the wildcard is available in this variable.
-.wen
-
-.vitem &$local_part_suffix$&
-.vindex "&$local_part_suffix$&"
-When an address is being routed or delivered, and a
-specific suffix for the local part was recognized, it is available in this
-variable, having been removed from &$local_part$&.
-
+If a local part prefix or suffix has been recognized, it is not included in the
+value of &$local_part$& during routing and subsequent delivery. The values of
+any prefix or suffix are in &$local_part_prefix$& and
+&$local_part_suffix$&, respectively.

 .new
 .new

-.vitem &$local_part_suffix_v$&
-.vindex "&$local_part_suffix_v$&"
-When &$local_part_suffix$& is valid and the suffix match used a wildcard,
-the portion matching the wildcard is available in this variable.
-.wen
+.cindex "tainted data"
+If the specification did not include a wildcard then
+the affix variable value is not tainted.

 
 

-.new
-.vitem &$local_part_verified$&
-.vindex "&$local_part_verified$&"
-If the router generic option &%check_local_part%& has run successfully,
-this variable has the user database version of &$local_part$&.
-Such values are not tainted and hence usable for building file names.
+If the affix specification included a wildcard then the portion of
+the affix matched by the wildcard is in
+&$local_part_prefix_v$& or &$local_part_suffix_v$& as appropriate,
+and both the whole and varying values are tainted.

 .wen
 
 .vitem &$local_scan_data$&
 .wen
 
 .vitem &$local_scan_data$&


@@ -12710,9 +12887,9 @@ header and the body).
 
 Here is an example of the use of this variable in a DATA ACL:
 .code
 
 Here is an example of the use of this variable in a DATA ACL:
 .code

-deny message   = Too many lines in message header
-     condition = \
+deny condition = \

       ${if <{250}{${eval:$message_linecount - $body_linecount}}}
       ${if <{250}{${eval:$message_linecount - $body_linecount}}}

+     message   = Too many lines in message header

 .endd
 In the MAIL and RCPT ACLs, the value is zero because at that stage the
 message has not yet been received.
 .endd
 In the MAIL and RCPT ACLs, the value is zero because at that stage the
 message has not yet been received.


@@ -13201,6 +13378,18 @@ library, by setting:
 dns_dnssec_ok = 1
 .endd
 
 dns_dnssec_ok = 1
 .endd
 

+.new
+In addition, on Linux with glibc 2.31 or newer the resolver library will
+default to stripping out a successful validation status.
+This will break a previously working Exim installation.
+Provided that you do trust the resolver (ie, is on localhost) you can tell
+glibc to pass through any successful validation with a new option in
+&_/etc/resolv.conf_&:
+.code
+options trust-ad
+.endd
+.wen
+

 Exim does not perform DNSSEC validation itself, instead leaving that to a
 validating resolver (e.g. unbound, or bind with suitable configuration).
 
 Exim does not perform DNSSEC validation itself, instead leaving that to a
 validating resolver (e.g. unbound, or bind with suitable configuration).
 


@@ -14309,6 +14498,7 @@ listed in more than one group.
 .row &%daemon_startup_sleep%&        "time to sleep between tries"
 .row &%extra_local_interfaces%&      "not necessarily listened on"
 .row &%local_interfaces%&            "on which to listen, with optional ports"
 .row &%daemon_startup_sleep%&        "time to sleep between tries"
 .row &%extra_local_interfaces%&      "not necessarily listened on"
 .row &%local_interfaces%&            "on which to listen, with optional ports"

+.row &%notifier_socket%&             "override compiled-in value"

 .row &%pid_file_path%&               "override compiled-in value"
 .row &%queue_run_max%&               "maximum simultaneous queue runners"
 .endtable
 .row &%pid_file_path%&               "override compiled-in value"
 .row &%queue_run_max%&               "maximum simultaneous queue runners"
 .endtable


@@ -14388,6 +14578,7 @@ listed in more than one group.
 .row &%percent_hack_domains%&        "recognize %-hack for these domains"
 .row &%spamd_address%&               "set interface to SpamAssassin"
 .row &%strict_acl_vars%&             "object to unset ACL variables"
 .row &%percent_hack_domains%&        "recognize %-hack for these domains"
 .row &%spamd_address%&               "set interface to SpamAssassin"
 .row &%strict_acl_vars%&             "object to unset ACL variables"

+.row &%spf_smtp_comment_template%&   "template for &$spf_smtp_comment$&"

 .endtable
 
 
 .endtable
 
 


@@ -14472,7 +14663,11 @@ See also the &'Policy controls'& section above.
 .table2
 .row &%dkim_verify_hashes%&          "DKIM hash methods accepted for signatures"
 .row &%dkim_verify_keytypes%&        "DKIM key types accepted for signatures"
 .table2
 .row &%dkim_verify_hashes%&          "DKIM hash methods accepted for signatures"
 .row &%dkim_verify_keytypes%&        "DKIM key types accepted for signatures"

+.row &%dkim_verify_min_keysizes%&    "DKIM key sizes accepted for signatures"

 .row &%dkim_verify_signers%&         "DKIM domains for which DKIM ACL is run"
 .row &%dkim_verify_signers%&         "DKIM domains for which DKIM ACL is run"

+.row &%dmarc_forensic_sender%&       "DMARC sender for report messages"
+.row &%dmarc_history_file%&          "DMARC results log"
+.row &%dmarc_tld_file%&              "DMARC toplevel domains file"

 .row &%host_lookup%&                 "host name looked up for these hosts"
 .row &%host_lookup_order%&           "order of DNS and local name lookups"
 .row &%recipient_unqualified_hosts%& "may send unqualified recipients"
 .row &%host_lookup%&                 "host name looked up for these hosts"
 .row &%host_lookup_order%&           "order of DNS and local name lookups"
 .row &%recipient_unqualified_hosts%& "may send unqualified recipients"


@@ -14620,6 +14815,7 @@ Those options that undergo string expansion before use are marked with
 .cindex "8-bit characters"
 .cindex "log" "selectors"
 .cindex "log" "8BITMIME"
 .cindex "8-bit characters"
 .cindex "log" "selectors"
 .cindex "log" "8BITMIME"

+.cindex "ESMTP extensions" 8BITMIME

 This option causes Exim to send 8BITMIME in its response to an SMTP
 EHLO command, and to accept the BODY= parameter on MAIL commands.
 However, though Exim is 8-bit clean, it is not a protocol converter, and it
 This option causes Exim to send 8BITMIME in its response to an SMTP
 EHLO command, and to accept the BODY= parameter on MAIL commands.
 However, though Exim is 8-bit clean, it is not a protocol converter, and it


@@ -14833,6 +15029,7 @@ That is, set the option to an empty string so that no check is done.
 .option auth_advertise_hosts main "host list&!!" *
 .cindex "authentication" "advertising"
 .cindex "AUTH" "advertising"
 .option auth_advertise_hosts main "host list&!!" *
 .cindex "authentication" "advertising"
 .cindex "AUTH" "advertising"

+.cindex "ESMTP extensions" AUTH

 If any server authentication mechanisms are configured, Exim advertises them in
 response to an EHLO command only if the calling host matches this list.
 Otherwise, Exim does not advertise AUTH.
 If any server authentication mechanisms are configured, Exim advertises them in
 response to an EHLO command only if the calling host matches this list.
 Otherwise, Exim does not advertise AUTH.


@@ -14894,12 +15091,18 @@ just the command name, it is not a complete command line. If an argument is
 required, it must come from the &%-oA%& command line option.
 
 
 required, it must come from the &%-oA%& command line option.
 
 

-.option bounce_message_file main string unset
+.option bounce_message_file main string&!! unset

 .cindex "bounce message" "customizing"
 .cindex "customizing" "bounce message"
 This option defines a template file containing paragraphs of text to be used
 for constructing bounce messages.  Details of the file's contents are given in
 .cindex "bounce message" "customizing"
 .cindex "customizing" "bounce message"
 This option defines a template file containing paragraphs of text to be used
 for constructing bounce messages.  Details of the file's contents are given in

-chapter &<<CHAPemsgcust>>&. See also &%warn_message_file%&.
+chapter &<<CHAPemsgcust>>&.
+.new
+.cindex bounce_message_file "tainted data"
+The option is expanded to give the file path, which must be
+absolute and untainted.
+.wen
+See also &%warn_message_file%&.

 
 
 .option bounce_message_text main string unset
 
 
 .option bounce_message_text main string unset


@@ -15088,6 +15291,7 @@ may wish to deliberately disable them.
 .option chunking_advertise_hosts main "host list&!!" *
 .cindex CHUNKING advertisement
 .cindex "RFC 3030" "CHUNKING"
 .option chunking_advertise_hosts main "host list&!!" *
 .cindex CHUNKING advertisement
 .cindex "RFC 3030" "CHUNKING"

+.cindex "ESMTP extensions" CHUNKING

 The CHUNKING extension (RFC3030) will be advertised in the EHLO message to
 these hosts.
 Hosts may use the BDAT command as an alternate to DATA.
 The CHUNKING extension (RFC3030) will be advertised in the EHLO message to
 these hosts.
 Hosts may use the BDAT command as an alternate to DATA.


@@ -15246,6 +15450,16 @@ This option gives a list of key types which are acceptable in signatures,
 and an order of processing.
 Signatures with algorithms not in the list will be ignored.
 
 and an order of processing.
 Signatures with algorithms not in the list will be ignored.
 

+
+.new
+.option dkim_verify_min_keysizes main "string list" "rsa=1024 ed25519=250"
+This option gives a list of key sizes which are acceptable in signatures.
+The list is keyed by the algorithm type for the key; the values are in bits.
+Signatures with keys smaller than given by this option will fail verification.
+
+The default enforces the RFC 8301 minimum key size for RSA signatures.
+.wen
+

 .option dkim_verify_minimal main boolean false
 If set to true, verification of signatures will terminate after the
 first success.
 .option dkim_verify_minimal main boolean false
 If set to true, verification of signatures will terminate after the
 first success.


@@ -15258,6 +15472,14 @@ the ACL once for each signature in the message.
 See section &<<SECDKIMVFY>>&.
 
 
 See section &<<SECDKIMVFY>>&.
 
 

+.option dmarc_forensic_sender main string&!! unset
+.option dmarc_history_file main string unset
+.option dmarc_tld_file main string unset
+.cindex DMARC "main section options"
+These options control DMARC processing.
+See section &<<SECDMARC>>& for details.
+
+

 .option dns_again_means_nonexist main "domain list&!!" unset
 .cindex "DNS" "&""try again""& response; overriding"
 DNS lookups give a &"try again"& response for the DNS errors
 .option dns_again_means_nonexist main "domain list&!!" unset
 .cindex "DNS" "&""try again""& response; overriding"
 DNS lookups give a &"try again"& response for the DNS errors


@@ -15328,6 +15550,18 @@ default. A value of 0 coerces DNSSEC off, a value of 1 coerces DNSSEC on.
 
 If the resolver library does not support DNSSEC then this option has no effect.
 
 
 If the resolver library does not support DNSSEC then this option has no effect.
 

+.new
+On Linux with glibc 2.31 or newer this is insufficient, the resolver library
+will default to stripping out a successful validation status.
+This will break a previously working Exim installation.
+Provided that you do trust the resolver (ie, is on localhost) you can tell
+glibc to pass through any successful validation with a new option in
+&_/etc/resolv.conf_&:
+.code
+options trust-ad
+.endd
+.wen
+

 
 .option dns_ipv4_lookup main "domain list&!!" unset
 .cindex "IPv6" "DNS lookup for AAAA records"
 
 .option dns_ipv4_lookup main "domain list&!!" unset
 .cindex "IPv6" "DNS lookup for AAAA records"


@@ -15417,6 +15651,7 @@ described in section &<<SECTlineendings>>&.
 .cindex "bounce messages" "success"
 .cindex "DSN" "success"
 .cindex "Delivery Status Notification" "success"
 .cindex "bounce messages" "success"
 .cindex "DSN" "success"
 .cindex "Delivery Status Notification" "success"

+.cindex "ESMTP extensions" DSN

 DSN extensions (RFC3461) will be advertised in the EHLO message to,
 and accepted from, these hosts.
 Hosts may use the NOTIFY and ENVID options on RCPT TO commands,
 DSN extensions (RFC3461) will be advertised in the EHLO message to,
 and accepted from, these hosts.
 Hosts may use the NOTIFY and ENVID options on RCPT TO commands,


@@ -15424,6 +15659,10 @@ and RET and ORCPT options on MAIL FROM commands.
 A NOTIFY=SUCCESS option requests success-DSN messages.
 A NOTIFY= option with no argument requests that no delay or failure DSNs
 are sent.
 A NOTIFY=SUCCESS option requests success-DSN messages.
 A NOTIFY= option with no argument requests that no delay or failure DSNs
 are sent.

+.new
+&*Note*&: Supplying success-DSN messages has been criticised
+on privacy grounds; it can leak details of internal forwarding.
+.wen

 
 .option dsn_from main "string&!!" "see below"
 .cindex "&'From:'& header line" "in bounces"
 
 .option dsn_from main "string&!!" "see below"
 .cindex "&'From:'& header line" "in bounces"


@@ -16305,6 +16544,11 @@ to depend on the IP address of the remote host for messages arriving via
 TCP/IP. After expansion, the value must be a sequence of decimal digits,
 optionally followed by K or M.
 
 TCP/IP. After expansion, the value must be a sequence of decimal digits,
 optionally followed by K or M.
 

+.cindex "SIZE" "ESMTP extension, advertising"
+.cindex "ESMTP extensions" SIZE
+If nonzero the value will be advertised as a parameter to the ESMTP SIZE
+service extension keyword.
+

 &*Note*&: This limit cannot be made to depend on a message's sender or any
 other properties of an individual message, because it has to be advertised in
 the server's response to EHLO. String expansion failure causes a temporary
 &*Note*&: This limit cannot be made to depend on a message's sender or any
 other properties of an individual message, because it has to be advertised in
 the server's response to EHLO. String expansion failure causes a temporary


@@ -16382,6 +16626,24 @@ harm. This option overrides the &%pipe_as_creator%& option of the &(pipe)&
 transport driver.
 
 
 transport driver.
 
 

+.new
+.option notifier_socket main string "$spool_directory/exim_daemon_notify"
+This option gives the name for a unix-domain socket on which the daemon
+listens for work and information-requests.
+Only installations running multiple daemons sharing a spool directory
+should need to modify the default.
+
+The option is expanded before use.
+If the platform supports Linux-style abstract socket names, the result
+is used with a nul byte prefixed.
+Otherwise, it should be a full path name and use a directory accessible
+to Exim.
+
+If the Exim command line uses a &%-oX%& option and does not use &%-oP%&
+then a notifier socket is not created.
+.wen
+
+

 .option openssl_options main "string list" "+no_sslv2 +no_sslv3 +single_dh_use +no_ticket +no_renegotiation"
 .cindex "OpenSSL "compatibility options"
 This option allows an administrator to adjust the SSL options applied
 .option openssl_options main "string list" "+no_sslv2 +no_sslv3 +single_dh_use +no_ticket +no_renegotiation"
 .cindex "OpenSSL "compatibility options"
 This option allows an administrator to adjust the SSL options applied


@@ -16554,6 +16816,7 @@ of the &%-oX%& option, unless a path is explicitly supplied by &%-oP%&.
 
 .option pipelining_advertise_hosts main "host list&!!" *
 .cindex "PIPELINING" "suppressing advertising"
 
 .option pipelining_advertise_hosts main "host list&!!" *
 .cindex "PIPELINING" "suppressing advertising"

+.cindex "ESMTP extensions" PIPELINING

 This option can be used to suppress the advertisement of the SMTP
 PIPELINING extension to specific hosts. See also the &*no_pipelining*&
 control in section &<<SECTcontrols>>&. When PIPELINING is not advertised and
 This option can be used to suppress the advertisement of the SMTP
 PIPELINING extension to specific hosts. See also the &*no_pipelining*&
 control in section &<<SECTcontrols>>&. When PIPELINING is not advertised and


@@ -16565,6 +16828,7 @@ not count as protocol errors (see &%smtp_max_synprot_errors%&).
 .option pipelining_connect_advertise_hosts main "host list&!!" *
 .cindex "pipelining" "early connection"
 .cindex "pipelining" PIPE_CONNECT
 .option pipelining_connect_advertise_hosts main "host list&!!" *
 .cindex "pipelining" "early connection"
 .cindex "pipelining" PIPE_CONNECT

+.cindex "ESMTP extensions" X_PIPE_CONNECT

 If Exim is built with the SUPPORT_PIPE_CONNECT build option
 this option controls which hosts the facility is advertised to
 and from which pipeline early-connection (before MAIL) SMTP
 If Exim is built with the SUPPORT_PIPE_CONNECT build option
 this option controls which hosts the facility is advertised to
 and from which pipeline early-connection (before MAIL) SMTP


@@ -16578,6 +16842,7 @@ Currently the option name &"X_PIPE_CONNECT"& is used.
 
 .option prdr_enable main boolean false
 .cindex "PRDR" "enabling on server"
 
 .option prdr_enable main boolean false
 .cindex "PRDR" "enabling on server"

+.cindex "ESMTP extensions" PRDR

 This option can be used to enable the Per-Recipient Data Response extension
 to SMTP, defined by Eric Hall.
 If the option is set, PRDR is advertised by Exim when operating as a server.
 This option can be used to enable the Per-Recipient Data Response extension
 to SMTP, defined by Eric Hall.
 If the option is set, PRDR is advertised by Exim when operating as a server.


@@ -16847,7 +17112,7 @@ received_header_text = Received: \
         ${if def:sender_helo_name {(helo=$sender_helo_name)\n\t}}}}\
   by $primary_hostname \
   ${if def:received_protocol {with $received_protocol }}\
         ${if def:sender_helo_name {(helo=$sender_helo_name)\n\t}}}}\
   by $primary_hostname \
   ${if def:received_protocol {with $received_protocol }}\

-  ${if def:tls_ver           { ($tls_ver)}}\
+  ${if def:tls_in_ver        { ($tls_in_ver)}}\

   ${if def:tls_in_cipher_std { tls $tls_in_cipher_std\n\t}}\
   (Exim $version_number)\n\t\
   ${if def:sender_address \
   ${if def:tls_in_cipher_std { tls $tls_in_cipher_std\n\t}}\
   (Exim $version_number)\n\t\
   ${if def:sender_address \


@@ -16856,7 +17121,8 @@ received_header_text = Received: \
   ${if def:received_for {\n\tfor $received_for}}
 .endd
 
   ${if def:received_for {\n\tfor $received_for}}
 .endd
 

-The reference to the TLS cipher is omitted when Exim is built without TLS
+The references to the TLS version and cipher are
+omitted when Exim is built without TLS

 support. The use of conditional expansions ensures that this works for both
 locally generated messages and messages received from remote hosts, giving
 header lines such as the following:
 support. The use of conditional expansions ensures that this works for both
 locally generated messages and messages received from remote hosts, giving
 header lines such as the following:


@@ -17296,6 +17562,7 @@ hosts), you can do so by an appropriate use of a &%control%& modifier in an ACL
 
 .option smtp_etrn_command main string&!! unset
 .cindex "ETRN" "command to be run"
 
 .option smtp_etrn_command main string&!! unset
 .cindex "ETRN" "command to be run"

+.cindex "ESMTP extensions" ETRN

 .vindex "&$domain$&"
 If this option is set, the given command is run whenever an SMTP ETRN
 command is received from a host that is permitted to issue such commands (see
 .vindex "&$domain$&"
 If this option is set, the given command is run whenever an SMTP ETRN
 command is received from a host that is permitted to issue such commands (see


@@ -17476,7 +17743,8 @@ example, instead of &"Administrative prohibition"&, it might give:
 
 
 .option smtputf8_advertise_hosts main "host list&!!" *
 
 
 .option smtputf8_advertise_hosts main "host list&!!" *

-.cindex "SMTPUTF8" "advertising"
+.cindex "SMTPUTF8" "ESMTP extension, advertising"
+.cindex "ESMTP extensions" SMTPUTF8

 When Exim is built with support for internationalised mail names,
 the availability thereof is advertised in
 response to EHLO only to those client hosts that match this option. See
 When Exim is built with support for internationalised mail names,
 the availability thereof is advertised in
 response to EHLO only to those client hosts that match this option. See


@@ -17494,6 +17762,48 @@ See section &<<SECTscanspamass>>& for more details.
 This option is available when Exim is compiled with SPF support.
 See section &<<SECSPF>>& for more details.
 
 This option is available when Exim is compiled with SPF support.
 See section &<<SECSPF>>& for more details.
 

+.new
+.option spf_smtp_comment_template main string&!! "Please%_see%_http://www.open-spf.org/Why"
+This option is available when Exim is compiled with SPF support.  It
+allows the customisation of the SMTP comment that the SPF library
+generates.  You are strongly encouraged to link to your own explanative
+site. The template must not contain spaces. If you need spaces in the
+output, use the proper placeholder. If libspf2 can not parse the
+template, it uses a built-in default broken link. The following placeholders
+(along with Exim variables (but see below)) are allowed in the template:
+.ilist
+&*%_*&: A space.
+.next
+&*%{L}*&: Envelope sender's local part.
+.next
+&*%{S}*&: Envelope sender.
+.next
+&*%{O}*&: Envelope sender's domain.
+.next
+&*%{D}*&: Current(?) domain.
+.next
+&*%{I}*&: SMTP client Ip.
+.next
+&*%{C}*&: SMTP client pretty IP.
+.next
+&*%{T}*&: Epoch time (UTC).
+.next
+&*%{P}*&: SMTP client domain name.
+.next
+&*%{V}*&: IP version.
+.next
+&*%{H}*&: EHLO/HELO domain.
+.next
+&*%{R}*&: Receiving domain.
+.endlist
+The capitalized placeholders do proper URL encoding, if you use them
+lowercased, no encoding takes place.  This list was compiled from the
+libspf2 sources.
+
+A note on using Exim variables: As
+currently the SPF library is initialized before the SMTP EHLO phase,
+the variables useful for expansion are quite limited.
+.wen

 
 
 .option split_spool_directory main boolean false
 
 
 .option split_spool_directory main boolean false


@@ -17767,6 +18077,7 @@ unfortunately not all, operating systems.
 .cindex "TLS" "advertising"
 .cindex "encryption" "on SMTP connection"
 .cindex "SMTP" "encrypted connection"
 .cindex "TLS" "advertising"
 .cindex "encryption" "on SMTP connection"
 .cindex "SMTP" "encrypted connection"

+.cindex "ESMTP extensions" STARTTLS

 When Exim is built with support for TLS encrypted connections, the availability
 of the STARTTLS command to set up an encrypted session is advertised in
 response to EHLO only to those client hosts that match this option. See
 When Exim is built with support for TLS encrypted connections, the availability
 of the STARTTLS command to set up an encrypted session is advertised in
 response to EHLO only to those client hosts that match this option. See


@@ -18204,14 +18515,20 @@ regular expression by a parenthesized subpattern. The default value for
 See &%uucp_from_pattern%& above.
 
 
 See &%uucp_from_pattern%& above.
 
 

-.option warn_message_file main string unset
+.option warn_message_file main string&!! unset

 .cindex "warning of delay" "customizing the message"
 .cindex "customizing" "warning message"
 This option defines a template file containing paragraphs of text to be used
 for constructing the warning message which is sent by Exim when a message has
 been in the queue for a specified amount of time, as specified by
 &%delay_warning%&. Details of the file's contents are given in chapter
 .cindex "warning of delay" "customizing the message"
 .cindex "customizing" "warning message"
 This option defines a template file containing paragraphs of text to be used
 for constructing the warning message which is sent by Exim when a message has
 been in the queue for a specified amount of time, as specified by
 &%delay_warning%&. Details of the file's contents are given in chapter

-&<<CHAPemsgcust>>&. See also &%bounce_message_file%&.
+&<<CHAPemsgcust>>&.
+.new
+.cindex warn_message_file "tainted data"
+The option is expanded to give the file path, which must be
+absolute and untainted.
+.wen
+See also &%bounce_message_file%&.

 
 
 .option write_rejectlog main boolean true
 
 
 .option write_rejectlog main boolean true


@@ -19022,7 +19339,7 @@ but the user is specified symbolically, the gid associated with the uid is
 used. For example:
 .code
 require_files = mail:/some/file
 used. For example:
 .code
 require_files = mail:/some/file

-require_files = $local_part:$home/.procmailrc
+require_files = $local_part_data:$home/.procmailrc

 .endd
 If a user or group name in a &%require_files%& list does not exist, the
 &%require_files%& condition fails.
 .endd
 If a user or group name in a &%require_files%& list does not exist, the
 &%require_files%& condition fails.


@@ -20155,8 +20472,10 @@ semicolon is the default route list separator.
 
 
 .section "Format of one host item" "SECTformatonehostitem"
 
 
 .section "Format of one host item" "SECTformatonehostitem"

-Each item in the list of hosts is either a host name or an IP address,
-optionally with an attached port number. When no port is given, an IP address
+Each item in the list of hosts can be either a host name or an IP address,
+optionally with an attached port number, or it can be a single "+"
+(see &%hosts_randomize%&).
+When no port is given, an IP address

 is not enclosed in brackets. When a port is specified, it overrides the port
 specification on the transport. The port is separated from the name or address
 by a colon. This leads to some complications:
 is not enclosed in brackets. When a port is specified, it overrides the port
 specification on the transport. The port is separated from the name or address
 by a colon. This leads to some complications:


@@ -21651,7 +21970,7 @@ local_users:
 # This transport overrides the group
 group_delivery:
   driver = appendfile
 # This transport overrides the group
 group_delivery:
   driver = appendfile

-  file = /var/spool/mail/$local_part
+  file = /var/spool/mail/$local_part_data

   group = mail
 .endd
 If &%user%& is set for a transport, its value overrides what is set in the
   group = mail
 .endd
 If &%user%& is set for a transport, its value overrides what is set in the


@@ -22166,7 +22485,7 @@ message. For example, a content scan could insert a new header line containing
 a spam score. This could be interpreted by a filter in the user's MUA. It is
 not possible to discard a message at this stage.
 
 a spam score. This could be interpreted by a filter in the user's MUA. It is
 not possible to discard a message at this stage.
 

-.cindex "SMTP" "SIZE"
+.cindex "SIZE" "ESMTP extension"

 A problem might arise if the filter increases the size of a message that is
 being sent down an SMTP connection. If the receiving SMTP server has indicated
 support for the SIZE parameter, Exim will have sent the size of the message
 A problem might arise if the filter increases the size of a message that is
 being sent down an SMTP connection. If the receiving SMTP server has indicated
 support for the SIZE parameter, Exim will have sent the size of the message


@@ -22486,7 +22805,7 @@ is used as a result of a &"keep"& action in the filter. This example shows one
 way of handling this requirement:
 .code
 file = ${if eq{$address_file}{inbox} \
 way of handling this requirement:
 .code
 file = ${if eq{$address_file}{inbox} \

-            {/var/mail/$local_part} \
+            {/var/mail/$local_part_data} \

             {${if eq{${substr_0_1:$address_file}}{/} \
                   {$address_file} \
                   {$home/mail/$address_file} \
             {${if eq{${substr_0_1:$address_file}}{/} \
                   {$address_file} \
                   {$home/mail/$address_file} \


@@ -22667,8 +22986,8 @@ The string value is expanded for each delivery, and must yield an absolute
 path. The most common settings of this option are variations on one of these
 examples:
 .code
 path. The most common settings of this option are variations on one of these
 examples:
 .code

-file = /var/spool/mail/$local_part
-file = /home/$local_part/inbox
+file = /var/spool/mail/$local_part_data
+file = /home/$local_part_data/inbox

 file = $home/inbox
 .endd
 .cindex "&""sticky""& bit"
 file = $home/inbox
 .endd
 .cindex "&""sticky""& bit"


@@ -23424,7 +23743,7 @@ and directories in a maildir mailbox, including subdirectories for maildir++
 folders. Consider this example:
 .code
 maildir_format = true
 folders. Consider this example:
 .code
 maildir_format = true

-directory = /var/mail/$local_part\
+directory = /var/mail/$local_part_data\

            ${if eq{$local_part_suffix}{}{}\
            {/.${substr_1:$local_part_suffix}}}
 maildirfolder_create_regex = /\.[^/]+$
            ${if eq{$local_part_suffix}{}{}\
            {/.${substr_1:$local_part_suffix}}}
 maildirfolder_create_regex = /\.[^/]+$


@@ -24414,14 +24733,14 @@ configuration for &%procmail%&:
 # transport
 procmail_pipe:
   driver = pipe
 # transport
 procmail_pipe:
   driver = pipe

-  command = /usr/local/bin/procmail -d $local_part
+  command = /usr/local/bin/procmail -d $local_part_data

   return_path_add
   delivery_date_add
   envelope_to_add
   check_string = "From "
   escape_string = ">From "
   umask = 077
   return_path_add
   delivery_date_add
   envelope_to_add
   check_string = "From "
   escape_string = ">From "
   umask = 077

-  user = $local_part
+  user = $local_part_data

   group = mail
 
 # router
   group = mail
 
 # router


@@ -24879,7 +25198,8 @@ facilities such as AUTH, PIPELINING, SIZE, and STARTTLS.
 
 .option hosts_avoid_pipelining smtp "host list&!!" unset
 .cindex "PIPELINING" "avoiding the use of"
 
 .option hosts_avoid_pipelining smtp "host list&!!" unset
 .cindex "PIPELINING" "avoiding the use of"

-Exim will not use the SMTP PIPELINING extension when delivering to any host
+.cindex "ESMTP extensions" PIPELINING
+Exim will not use the ESMTP PIPELINING extension when delivering to any host

 that matches this list, even if the server host advertises PIPELINING support.
 
 .option hosts_pipe_connect smtp "host list&!!" unset
 that matches this list, even if the server host advertises PIPELINING support.
 
 .option hosts_pipe_connect smtp "host list&!!" unset


@@ -25083,6 +25403,7 @@ such as DNSBL lookups, will still delay the emission of the SMTP banner.
 
 .option hosts_try_prdr smtp "host list&!!" *
 .cindex "PRDR" "enabling, optional in client"
 
 .option hosts_try_prdr smtp "host list&!!" *
 .cindex "PRDR" "enabling, optional in client"

+.cindex "ESMTP extensions" PRDR

 This option provides a list of servers to which, provided they announce
 PRDR support, Exim will attempt to negotiate PRDR
 for multi-recipient messages.
 This option provides a list of servers to which, provided they announce
 PRDR support, Exim will attempt to negotiate PRDR
 for multi-recipient messages.


@@ -25240,7 +25561,7 @@ See also the &%max_parallel%& generic transport option.
 
 
 .option size_addition smtp integer 1024
 
 
 .option size_addition smtp integer 1024

-.cindex "SMTP" "SIZE"
+.cindex "SIZE" "ESMTP extension"

 .cindex "message" "size issue for transport filter"
 .cindex "size" "of message"
 .cindex "transport" "filter"
 .cindex "message" "size issue for transport filter"
 .cindex "size" "of message"
 .cindex "transport" "filter"


@@ -25425,13 +25746,17 @@ The &%tls_verify_certificates%& option must also be set.
 If both this option and &%tls_try_verify_hosts%& are unset
 operation is as if this option selected all hosts.
 
 If both this option and &%tls_try_verify_hosts%& are unset
 operation is as if this option selected all hosts.
 

-.option utf8_downconvert smtp integer!! unset
+.option utf8_downconvert smtp integer&!! -1

 .cindex utf8 "address downconversion"
 .cindex i18n "utf8 address downconversion"
 If built with internationalization support,
 .cindex utf8 "address downconversion"
 .cindex i18n "utf8 address downconversion"
 If built with internationalization support,

-this option controls conversion of UTF-8 in message addresses
+this option controls conversion of UTF-8 in message envelope addresses

 to a-label form.
 to a-label form.

-For details see section &<<SECTi18nMTA>>&.
+If, after expansion, the value is 1, 0, or -1 then this value overrides
+any value previously set for the message.  Otherwise, any previously
+set value is used.  To permit use of a previous value,
+set this option to an empty string.
+For details on the values see section &<<SECTi18nMTA>>&.

 
 
 
 
 
 


@@ -26539,6 +26864,7 @@ transfer of mail between servers that have no managerial connection with each
 other.
 
 .cindex "AUTH" "description of"
 other.
 
 .cindex "AUTH" "description of"

+.cindex "ESMTP extensions" AUTH

 Very briefly, the way SMTP authentication works is as follows:
 
 .ilist
 Very briefly, the way SMTP authentication works is as follows:
 
 .ilist


@@ -28570,6 +28896,7 @@ tls_require_ciphers = ${if =={$received_port}{25}\
 
 .section "Configuring an Exim server to use TLS" "SECID182"
 .cindex "TLS" "configuring an Exim server"
 
 .section "Configuring an Exim server to use TLS" "SECID182"
 .cindex "TLS" "configuring an Exim server"

+.cindex "ESMTP extensions" STARTTLS

 When Exim has been built with TLS support, it advertises the availability of
 the STARTTLS command to client hosts that match &%tls_advertise_hosts%&,
 but not to any others. The default value of this option is *, which means
 When Exim has been built with TLS support, it advertises the availability of
 the STARTTLS command to client hosts that match &%tls_advertise_hosts%&,
 but not to any others. The default value of this option is *, which means


@@ -28829,6 +29156,7 @@ deliveries as well as to incoming, the latter one causing logging of the
 server certificate's DN. The remaining client configuration for TLS is all
 within the &(smtp)& transport.
 
 server certificate's DN. The remaining client configuration for TLS is all
 within the &(smtp)& transport.
 

+.cindex "ESMTP extensions" STARTTLS

 It is not necessary to set any options to have TLS work in the &(smtp)&
 transport. If Exim is built with TLS support, and TLS is advertised by a
 server, the &(smtp)& transport always tries to start a TLS session. However,
 It is not necessary to set any options to have TLS work in the &(smtp)&
 transport. If Exim is built with TLS support, and TLS is advertised by a
 server, the &(smtp)& transport always tries to start a TLS session. However,


@@ -29967,8 +30295,8 @@ The &%message%& modifier operates exactly as it does for &%accept%&.
 &%drop%&: This verb behaves like &%deny%&, except that an SMTP connection is
 forcibly closed after the 5&'xx'& error message has been sent. For example:
 .code
 &%drop%&: This verb behaves like &%deny%&, except that an SMTP connection is
 forcibly closed after the 5&'xx'& error message has been sent. For example:
 .code

-drop   message   = I don't take more than 20 RCPTs
-       condition = ${if > {$rcpt_count}{20}}
+drop   condition = ${if > {$rcpt_count}{20}}
+       message   = I don't take more than 20 RCPTs

 .endd
 There is no difference between &%deny%& and &%drop%& for the connect-time ACL.
 The connection is always dropped after sending a 550 response.
 .endd
 There is no difference between &%deny%& and &%drop%& for the connect-time ACL.
 The connection is always dropped after sending a 550 response.


@@ -30771,6 +31099,7 @@ calling host. Its effect lasts until the end of the SMTP connection.
 
 .vitem &*control&~=&~no_pipelining*&
 .cindex "PIPELINING" "suppressing advertising"
 
 .vitem &*control&~=&~no_pipelining*&
 .cindex "PIPELINING" "suppressing advertising"

+.cindex "ESMTP extensions" PIPELINING

 This control turns off the advertising of the PIPELINING extension to SMTP in
 the current session. To be useful, it must be obeyed before Exim sends its
 response to an EHLO command. Therefore, it should normally appear in an ACL
 This control turns off the advertising of the PIPELINING extension to SMTP in
 the current session. To be useful, it must be obeyed before Exim sends its
 response to an EHLO command. Therefore, it should normally appear in an ACL


@@ -30846,7 +31175,7 @@ data is read.
 that are being submitted at the same time using &%-bs%& or &%-bS%&.
 
 .vitem &*control&~=&~utf8_downconvert*&
 that are being submitted at the same time using &%-bs%& or &%-bS%&.
 
 .vitem &*control&~=&~utf8_downconvert*&

-This control enables conversion of UTF-8 in message addresses
+This control enables conversion of UTF-8 in message envelope addresses

 to a-label form.
 For details see section &<<SECTi18nMTA>>&.
 .endlist vlist
 to a-label form.
 For details see section &<<SECTi18nMTA>>&.
 .endlist vlist


@@ -31203,7 +31532,7 @@ of the lookup is made available in the &$host_data$& variable. This
 allows you, for example, to set up a statement like this:
 .code
 deny  hosts = net-lsearch;/some/file
 allows you, for example, to set up a statement like this:
 .code
 deny  hosts = net-lsearch;/some/file

-message = $host_data
+      message = $host_data

 .endd
 which gives a custom error message for each denied host.
 
 .endd
 which gives a custom error message for each denied host.
 


@@ -31347,8 +31676,8 @@ section &<<SECTaddressverification>>& (callouts are described in section
 condition to restrict it to bounce messages only:
 .code
 deny    senders = :
 condition to restrict it to bounce messages only:
 .code
 deny    senders = :

-        message = A valid sender header is required for bounces

        !verify  = header_sender
        !verify  = header_sender

+        message = A valid sender header is required for bounces

 .endd
 
 .vitem &*verify&~=&~header_syntax*&
 .endd
 
 .vitem &*verify&~=&~header_syntax*&


@@ -31530,8 +31859,8 @@ Testing the list of domains stops as soon as a match is found. If you want to
 warn for one list and block for another, you can use two different statements:
 .code
 deny  dnslists = blackholes.mail-abuse.org
 warn for one list and block for another, you can use two different statements:
 .code
 deny  dnslists = blackholes.mail-abuse.org

-warn  message  = X-Warn: sending host is on dialups list
-      dnslists = dialups.mail-abuse.org
+warn  dnslists = dialups.mail-abuse.org
+      message  = X-Warn: sending host is on dialups list

 .endd
 .cindex caching "of dns lookup"
 .cindex DNS TTL
 .endd
 .cindex caching "of dns lookup"
 .cindex DNS TTL


@@ -31572,8 +31901,8 @@ addresses (see, e.g., the &'domain based zones'& link at
 with these lists. You can change the name that is looked up in a DNS list by
 listing it after the domain name, introduced by a slash. For example,
 .code
 with these lists. You can change the name that is looked up in a DNS list by
 listing it after the domain name, introduced by a slash. For example,
 .code

-deny  message  = Sender's domain is listed at $dnslist_domain
-      dnslists = dsn.rfc-ignorant.org/$sender_address_domain
+deny  dnslists = dsn.rfc-ignorant.org/$sender_address_domain
+      message  = Sender's domain is listed at $dnslist_domain

 .endd
 This particular example is useful only in ACLs that are obeyed after the
 RCPT or DATA commands, when a sender address is available. If (for
 .endd
 This particular example is useful only in ACLs that are obeyed after the
 RCPT or DATA commands, when a sender address is available. If (for


@@ -31637,13 +31966,13 @@ dnslists = black.list.tld/a.domain::b.domain
 However, when the data for the list is obtained from a lookup, the second form
 is usually much more convenient. Consider this example:
 .code
 However, when the data for the list is obtained from a lookup, the second form
 is usually much more convenient. Consider this example:
 .code

-deny message  = The mail servers for the domain \
+deny dnslists = sbl.spamhaus.org/<|${lookup dnsdb {>|a=<|\
+                                   ${lookup dnsdb {>|mxh=\
+                                   $sender_address_domain} }} }
+     message  = The mail servers for the domain \

                 $sender_address_domain \
                 are listed at $dnslist_domain ($dnslist_value); \
                 see $dnslist_text.
                 $sender_address_domain \
                 are listed at $dnslist_domain ($dnslist_value); \
                 see $dnslist_text.

-     dnslists = sbl.spamhaus.org/<|${lookup dnsdb {>|a=<|\
-                                   ${lookup dnsdb {>|mxh=\
-                                   $sender_address_domain} }} }

 .endd
 Note the use of &`>|`& in the dnsdb lookup to specify the separator for
 multiple DNS records. The inner dnsdb lookup produces a list of MX hosts
 .endd
 Note the use of &`>|`& in the dnsdb lookup to specify the separator for
 multiple DNS records. The inner dnsdb lookup produces a list of MX hosts


@@ -31716,7 +32045,7 @@ very meaningful. See section &<<SECTmordetinf>>& for a way of obtaining more
 information.
 
 You can use the DNS list variables in &%message%& or &%log_message%& modifiers
 information.
 
 You can use the DNS list variables in &%message%& or &%log_message%& modifiers

-&-- although these appear before the condition in the ACL, they are not
+&-- even if these appear before the condition in the ACL, they are not

 expanded until after it has failed. For example:
 .code
 deny    hosts = !+local_networks
 expanded until after it has failed. For example:
 .code
 deny    hosts = !+local_networks


@@ -31902,12 +32231,12 @@ restrictions, to get the TXT record. As a byproduct of this, there is also
 a check that the IP being tested is indeed on the first list. The first
 domain is the one that is put in &$dnslist_domain$&. For example:
 .code
 a check that the IP being tested is indeed on the first list. The first
 domain is the one that is put in &$dnslist_domain$&. For example:
 .code

-deny message  = \
-         rejected because $sender_host_address is blacklisted \
-         at $dnslist_domain\n$dnslist_text
-       dnslists = \
+deny   dnslists = \

          sbl.spamhaus.org,sbl-xbl.spamhaus.org=127.0.0.2 : \
          dul.dnsbl.sorbs.net,dnsbl.sorbs.net=127.0.0.10
          sbl.spamhaus.org,sbl-xbl.spamhaus.org=127.0.0.2 : \
          dul.dnsbl.sorbs.net,dnsbl.sorbs.net=127.0.0.10

+       message  = \
+         rejected because $sender_host_address is blacklisted \
+         at $dnslist_domain\n$dnslist_text

 .endd
 For the first blacklist item, this starts by doing a lookup in
 &'sbl-xbl.spamhaus.org'& and testing for a 127.0.0.2 return. If there is a
 .endd
 For the first blacklist item, this starts by doing a lookup in
 &'sbl-xbl.spamhaus.org'& and testing for a 127.0.0.2 return. If there is a


@@ -32097,12 +32426,12 @@ new rate.
 .code
 acl_check_connect:
  deny ratelimit = 100 / 5m / readonly
 .code
 acl_check_connect:
  deny ratelimit = 100 / 5m / readonly

-    log_message = RATE CHECK: $sender_rate/$sender_rate_period \
+      log_message = RATE CHECK: $sender_rate/$sender_rate_period \

                   (max $sender_rate_limit)
 # ...
 acl_check_mail:
  warn ratelimit = 100 / 5m / strict
                   (max $sender_rate_limit)
 # ...
 acl_check_mail:
  warn ratelimit = 100 / 5m / strict

-    log_message = RATE UPDATE: $sender_rate/$sender_rate_period \
+      log_message = RATE UPDATE: $sender_rate/$sender_rate_period \

                   (max $sender_rate_limit)
 .endd
 
                   (max $sender_rate_limit)
 .endd
 


@@ -32212,16 +32541,16 @@ deny authenticated = *
      ratelimit = 100 / 1d / strict / $authenticated_id
 
 # System-wide rate limit
      ratelimit = 100 / 1d / strict / $authenticated_id
 
 # System-wide rate limit

-defer message = Sorry, too busy. Try again later.
-     ratelimit = 10 / 1s / $primary_hostname
+defer ratelimit = 10 / 1s / $primary_hostname
+      message = Sorry, too busy. Try again later.

 
 # Restrict incoming rate from each host, with a default
 # set using a macro and special cases looked up in a table.
 
 # Restrict incoming rate from each host, with a default
 # set using a macro and special cases looked up in a table.

-defer message = Sender rate exceeds $sender_rate_limit \
-               messages per $sender_rate_period
-     ratelimit = ${lookup {$sender_host_address} \
+defer ratelimit = ${lookup {$sender_host_address} \

                    cdb {DB/ratelimits.cdb} \
                    {$value} {RATELIMIT} }
                    cdb {DB/ratelimits.cdb} \
                    {$value} {RATELIMIT} }

+      message = Sender rate exceeds $sender_rate_limit \
+               messages per $sender_rate_period

 .endd
 &*Warning*&: If you have a busy server with a lot of &%ratelimit%& tests,
 especially with the &%per_rcpt%& option, you may suffer from a performance
 .endd
 &*Warning*&: If you have a busy server with a lot of &%ratelimit%& tests,
 especially with the &%per_rcpt%& option, you may suffer from a performance


@@ -32810,16 +33139,16 @@ list called &%batv_senders%&. Then, in the ACL for RCPT commands, you could
 use this:
 .code
 # Bounces: drop unsigned addresses for BATV senders
 use this:
 .code
 # Bounces: drop unsigned addresses for BATV senders

-deny message = This address does not send an unsigned reverse path
-     senders = :
+deny senders = :

      recipients = +batv_senders
      recipients = +batv_senders

+     message = This address does not send an unsigned reverse path

 
 # Bounces: In case of prvs-signed address, check signature.
 
 # Bounces: In case of prvs-signed address, check signature.

-deny message = Invalid reverse path signature.
-     senders = :
+deny senders = :

      condition  = ${prvscheck {$local_part@$domain}\
                   {PRVSCHECK_SQL}{1}}
      !condition = $prvscheck_result
      condition  = ${prvscheck {$local_part@$domain}\
                   {PRVSCHECK_SQL}{1}}
      !condition = $prvscheck_result

+     message = Invalid reverse path signature.

 .endd
 The first statement rejects recipients for bounce messages that are addressed
 to plain BATV sender addresses, because it is known that BATV senders do not
 .endd
 The first statement rejects recipients for bounce messages that are addressed
 to plain BATV sender addresses, because it is known that BATV senders do not


@@ -33356,13 +33685,13 @@ imposed by your anti-virus scanner.
 
 Here is a very simple scanning example:
 .code
 
 Here is a very simple scanning example:
 .code

-deny message = This message contains malware ($malware_name)
-     malware = *
+deny malware = *
+     message = This message contains malware ($malware_name)

 .endd
 The next example accepts messages when there is a problem with the scanner:
 .code
 .endd
 The next example accepts messages when there is a problem with the scanner:
 .code

-deny message = This message contains malware ($malware_name)
-     malware = */defer_ok
+deny malware = */defer_ok
+     message = This message contains malware ($malware_name)

 .endd
 The next example shows how to use an ACL variable to scan with both sophie and
 aveserver. It assumes you have set:
 .endd
 The next example shows how to use an ACL variable to scan with both sophie and
 aveserver. It assumes you have set:


@@ -33371,13 +33700,13 @@ av_scanner = $acl_m0
 .endd
 in the main Exim configuration.
 .code
 .endd
 in the main Exim configuration.
 .code

-deny message = This message contains malware ($malware_name)
-     set acl_m0 = sophie
+deny set acl_m0 = sophie

      malware = *
      malware = *

+     message = This message contains malware ($malware_name)

 
 

-deny message = This message contains malware ($malware_name)
-     set acl_m0 = aveserver
+deny set acl_m0 = aveserver

      malware = *
      malware = *

+     message = This message contains malware ($malware_name)

 .endd
 
 
 .endd
 
 


@@ -33506,8 +33835,8 @@ is set to record the actual address used.
 .section "Calling SpamAssassin from an Exim ACL" "SECID206"
 Here is a simple example of the use of the &%spam%& condition in a DATA ACL:
 .code
 .section "Calling SpamAssassin from an Exim ACL" "SECID206"
 Here is a simple example of the use of the &%spam%& condition in a DATA ACL:
 .code

-deny message = This message was classified as SPAM
-     spam = joe
+deny spam = joe
+     message = This message was classified as SPAM

 .endd
 The right-hand side of the &%spam%& condition specifies a name. This is
 relevant if you have set up multiple SpamAssassin profiles. If you do not want
 .endd
 The right-hand side of the &%spam%& condition specifies a name. This is
 relevant if you have set up multiple SpamAssassin profiles. If you do not want


@@ -33539,9 +33868,9 @@ large ones may cause significant performance degradation. As most spam messages
 are quite small, it is recommended that you do not scan the big ones. For
 example:
 .code
 are quite small, it is recommended that you do not scan the big ones. For
 example:
 .code

-deny message = This message was classified as SPAM
-     condition = ${if < {$message_size}{10K}}
+deny condition = ${if < {$message_size}{10K}}

      spam = nobody
      spam = nobody

+     message = This message was classified as SPAM

 .endd
 
 The &%spam%& condition returns true if the threshold specified in the user's
 .endd
 
 The &%spam%& condition returns true if the threshold specified in the user's


@@ -33599,8 +33928,8 @@ failed. If you want to treat DEFER as FAIL (to pass on to the next ACL
 statement block), append &`/defer_ok`& to the right-hand side of the
 spam condition, like this:
 .code
 statement block), append &`/defer_ok`& to the right-hand side of the
 spam condition, like this:
 .code

-deny message = This message was classified as SPAM
-     spam    = joe/defer_ok
+deny spam    = joe/defer_ok
+     message = This message was classified as SPAM

 .endd
 This causes messages to be accepted even if there is a problem with &%spamd%&.
 
 .endd
 This causes messages to be accepted even if there is a problem with &%spamd%&.
 


@@ -33618,9 +33947,9 @@ warn  spam = nobody
       add_header = Subject: *SPAM* $h_Subject:
 
 # reject spam at high scores (> 12)
       add_header = Subject: *SPAM* $h_Subject:
 
 # reject spam at high scores (> 12)

-deny  message = This message scored $spam_score spam points.
-      spam = nobody:true
+deny  spam = nobody:true

       condition = ${if >{$spam_score_int}{120}{1}{0}}
       condition = ${if >{$spam_score_int}{120}{1}{0}}

+      message = This message scored $spam_score spam points.

 .endd
 
 
 .endd
 
 


@@ -33824,10 +34153,10 @@ As an example, the following will ban &"HTML mail"& (including that sent with
 alternative plain text), while allowing HTML files to be attached. HTML
 coverletter mail attached to non-HTML coverletter mail will also be allowed:
 .code
 alternative plain text), while allowing HTML files to be attached. HTML
 coverletter mail attached to non-HTML coverletter mail will also be allowed:
 .code

-deny message = HTML mail is not accepted here
-!condition = $mime_is_rfc822
-condition = $mime_is_coverletter
-condition = ${if eq{$mime_content_type}{text/html}{1}{0}}
+deny !condition = $mime_is_rfc822
+     condition = $mime_is_coverletter
+     condition = ${if eq{$mime_content_type}{text/html}{1}{0}}
+     message = HTML mail is not accepted here

 .endd
 
 .vitem &$mime_is_multipart$&
 .endd
 
 .vitem &$mime_is_multipart$&


@@ -33880,8 +34209,8 @@ expanded before being used, you must also escape dollar signs and backslashes
 with more backslashes, or use the &`\N`& facility to disable expansion.
 Here is a simple example that contains two regular expressions:
 .code
 with more backslashes, or use the &`\N`& facility to disable expansion.
 Here is a simple example that contains two regular expressions:
 .code

-deny message = contains blacklisted regex ($regex_match_string)
-     regex = [Mm]ortgage : URGENT BUSINESS PROPOSAL
+deny regex = [Mm]ortgage : URGENT BUSINESS PROPOSAL
+     message = contains blacklisted regex ($regex_match_string)

 .endd
 The conditions returns true if any one of the regular expressions matches. The
 &$regex_match_string$& expansion variable is then set up and contains the
 .endd
 The conditions returns true if any one of the regular expressions matches. The
 &$regex_match_string$& expansion variable is then set up and contains the


@@ -34976,7 +35305,7 @@ central_filter:
   check_local_user
   driver = redirect
   domains = +local_domains
   check_local_user
   driver = redirect
   domains = +local_domains

-  file = /central/filters/$local_part
+  file = /central/filters/$local_part_data

   no_verify
   allow_filter
   allow_freeze
   no_verify
   allow_filter
   allow_freeze


@@ -35734,13 +36063,14 @@ used to contain the envelope information.
 .cindex "outgoing LMTP over TCP/IP"
 .cindex "EHLO"
 .cindex "HELO"
 .cindex "outgoing LMTP over TCP/IP"
 .cindex "EHLO"
 .cindex "HELO"

-.cindex "SIZE option on MAIL command"
+.cindex "SIZE" "option on MAIL command"

 Outgoing SMTP and LMTP over TCP/IP is implemented by the &(smtp)& transport.
 The &%protocol%& option selects which protocol is to be used, but the actual
 processing is the same in both cases.
 
 Outgoing SMTP and LMTP over TCP/IP is implemented by the &(smtp)& transport.
 The &%protocol%& option selects which protocol is to be used, but the actual
 processing is the same in both cases.
 

+.cindex "ESMTP extensions" SIZE

 If, in response to its EHLO command, Exim is told that the SIZE
 If, in response to its EHLO command, Exim is told that the SIZE

-parameter is supported, it adds SIZE=<&'n'&> to each subsequent MAIL
+extension is supported, it adds SIZE=<&'n'&> to each subsequent MAIL

 command. The value of <&'n'&> is the message size plus the value of the
 &%size_addition%& option (default 1024) to allow for additions to the message
 such as per-transport header lines, or changes made in a
 command. The value of <&'n'&> is the message size plus the value of the
 &%size_addition%& option (default 1024) to allow for additions to the message
 such as per-transport header lines, or changes made in a


@@ -36136,7 +36466,8 @@ RCPT failures.
 
 .section "The ETRN command" "SECTETRN"
 .cindex "ETRN" "processing"
 
 .section "The ETRN command" "SECTETRN"
 .cindex "ETRN" "processing"

-RFC 1985 describes an SMTP command called ETRN that is designed to
+.cindex "ESMTP extensions" ETRN
+RFC 1985 describes an ESMTP command called ETRN that is designed to

 overcome the security problems of the TURN command (which has fallen into
 disuse). When Exim receives an ETRN command on a TCP/IP connection, it runs
 the ACL specified by &%acl_smtp_etrn%& in order to decide whether the command
 overcome the security problems of the TURN command (which has fallen into
 disuse). When Exim receives an ETRN command on a TCP/IP connection, it runs
 the ACL specified by &%acl_smtp_etrn%& in order to decide whether the command


@@ -36491,10 +36822,10 @@ lists in a separate domain from normal mail. For example:
 lists:
   driver = redirect
   domains = lists.example
 lists:
   driver = redirect
   domains = lists.example

-  file = /usr/lists/$local_part
+  file = ${lookup {$local_part} dsearch,ret=full {/usr/lists}}

   forbid_pipe
   forbid_file
   forbid_pipe
   forbid_file

-  errors_to = $local_part-request@lists.example
+  errors_to = ${quote_local_part:$local_part-request}@lists.example

   no_more
 .endd
 This router is skipped for domains other than &'lists.example'&. For addresses
   no_more
 .endd
 This router is skipped for domains other than &'lists.example'&. For addresses


@@ -36582,7 +36913,8 @@ lists_request:
   driver = redirect
   domains = lists.example
   local_part_suffix = -request
   driver = redirect
   domains = lists.example
   local_part_suffix = -request

-  file = /usr/lists/$local_part$local_part_suffix
+  local_parts = ${lookup {$local_part} dsearch,filter=file {/usr/lists}}
+  file = /usr/lists/${local_part_data}-request

   no_more
 
 lists_post:
   no_more
 
 lists_post:


@@ -36590,10 +36922,10 @@ lists_post:
   domains = lists.example
   senders = ${if exists {/usr/lists/$local_part}\
              {lsearch;/usr/lists/$local_part}{*}}
   domains = lists.example
   senders = ${if exists {/usr/lists/$local_part}\
              {lsearch;/usr/lists/$local_part}{*}}

-  file = /usr/lists/$local_part
+  file = ${lookup {$local_part} dsearch,ret=full {/usr/lists}}

   forbid_pipe
   forbid_file
   forbid_pipe
   forbid_file

-  errors_to = $local_part-request@lists.example
+  errors_to = ${quote_local_part:$local_part-request}@lists.example

   no_more
 
 lists_closed:
   no_more
 
 lists_closed:


@@ -36651,7 +36983,7 @@ verp_smtp:
   max_rcpt = 1
   return_path = \
     ${if match {$return_path}{^(.+?)-request@your.dom.example\$}\
   max_rcpt = 1
   return_path = \
     ${if match {$return_path}{^(.+?)-request@your.dom.example\$}\

-      {$1-request+$local_part=$domain@your.dom.example}fail}
+      {${quote_local_part:$1-request+$local_part=$domain}@your.dom.example}fail}

 .endd
 This has the effect of rewriting the return path (envelope sender) on outgoing
 SMTP messages, if the local part of the original return path ends in
 .endd
 This has the effect of rewriting the return path (envelope sender) on outgoing
 SMTP messages, if the local part of the original return path ends in


@@ -36702,7 +37034,7 @@ verp_dnslookup:
   transport = remote_smtp
   errors_to = \
     ${if match {$return_path}{^(.+?)-request@your.dom.example\$}}
   transport = remote_smtp
   errors_to = \
     ${if match {$return_path}{^(.+?)-request@your.dom.example\$}}

-     {$1-request+$local_part=$domain@your.dom.example}fail}
+     {${quote_local_part:$1-request+$local_part=$domain}@your.dom.example}fail}

   no_more
 .endd
 Before you start sending out messages with VERPed return paths, you must also
   no_more
 .endd
 Before you start sending out messages with VERPed return paths, you must also


@@ -36750,12 +37082,18 @@ to a router of this form:
 virtual:
   driver = redirect
   domains = dsearch;/etc/mail/virtual
 virtual:
   driver = redirect
   domains = dsearch;/etc/mail/virtual

-  data = ${lookup{$local_part}lsearch{/etc/mail/virtual/$domain}}
+  data = ${lookup{$local_part}lsearch{/etc/mail/virtual/$domain_data}}

   no_more
 .endd
   no_more
 .endd

+.new

 The &%domains%& option specifies that the router is to be skipped, unless there
 is a file in the &_/etc/mail/virtual_& directory whose name is the same as the
 The &%domains%& option specifies that the router is to be skipped, unless there
 is a file in the &_/etc/mail/virtual_& directory whose name is the same as the

-domain that is being processed. When the router runs, it looks up the local
+domain that is being processed.
+The &(dsearch)& lookup used results in an untainted version of &$domain$&
+being placed into the &$domain_data$& variable.
+.wen
+
+When the router runs, it looks up the local

 part in the file to find a new address (or list of addresses). The &%no_more%&
 setting ensures that if the lookup fails (leading to &%data%& being an empty
 string), Exim gives up on the address without trying any subsequent routers.
 part in the file to find a new address (or list of addresses). The &%no_more%&
 setting ensures that if the lookup fails (leading to &%data%& being an empty
 string), Exim gives up on the address without trying any subsequent routers.


@@ -36784,7 +37122,7 @@ follows:
 .code
 my_mailboxes:
   driver = appendfile
 .code
 my_mailboxes:
   driver = appendfile

-  file = /var/mail/$domain/$local_part
+  file = /var/mail/$domain/$local_part_data

   user = mail
 .endd
 This uses a directory of mailboxes for each domain. The &%user%& setting is
   user = mail
 .endd
 This uses a directory of mailboxes for each domain. The &%user%& setting is


@@ -36839,9 +37177,9 @@ another MTA:
 userforward:
   driver = redirect
   check_local_user
 userforward:
   driver = redirect
   check_local_user

-  file = $home/.forward$local_part_suffix

   local_part_suffix = -*
   local_part_suffix_optional
   local_part_suffix = -*
   local_part_suffix_optional

+  file = ${lookup {.forward$local_part_suffix} dsearch,ret=full {$home} {$value}fail}

   allow_filter
 .endd
 If there is no suffix, &_.forward_& is used; if the suffix is &'-special'&, for
   allow_filter
 .endd
 If there is no suffix, &_.forward_& is used; if the suffix is &'-special'&, for


@@ -40310,7 +40648,7 @@ only supports signing with the same canonicalization method for both headers and
 .option dkim_strict smtp string&!! unset
 This  option  defines  how  Exim  behaves  when  signing a message that
 should be signed fails for some reason.  When the expansion evaluates to
 .option dkim_strict smtp string&!! unset
 This  option  defines  how  Exim  behaves  when  signing a message that
 should be signed fails for some reason.  When the expansion evaluates to

-either "1" or "true", Exim will defer. Otherwise Exim will send the message
+either &"1"& or &"true"&, Exim will defer. Otherwise Exim will send the message

 unsigned. You can use the &%$dkim_domain%& and &%$dkim_selector%& expansion
 variables here.
 
 unsigned. You can use the &%$dkim_domain%& and &%$dkim_selector%& expansion
 variables here.
 


@@ -40322,16 +40660,19 @@ in the message signature.
 When unspecified, the header names listed in RFC4871 will be used,
 whether or not each header is present in the message.
 The default list is available for the expansion in the macro
 When unspecified, the header names listed in RFC4871 will be used,
 whether or not each header is present in the message.
 The default list is available for the expansion in the macro

-"_DKIM_SIGN_HEADERS".
+&"_DKIM_SIGN_HEADERS"&
+.new
+and an oversigning variant is in &"_DKIM_OVERSIGN_HEADERS"&.
+.wen

 
 If a name is repeated, multiple headers by that name (or the absence thereof)
 will be signed.  The textually later headers in the headers part of the
 message are signed first, if there are multiples.
 
 
 If a name is repeated, multiple headers by that name (or the absence thereof)
 will be signed.  The textually later headers in the headers part of the
 message are signed first, if there are multiples.
 

-A name can be prefixed with either an '=' or a '+' character.
-If an '=' prefix is used, all headers that are present with this name
+A name can be prefixed with either an &"="& or a &"+"& character.
+If an &"="& prefix is used, all headers that are present with this name

 will be signed.
 will be signed.

-If a '+' prefix if used, all headers that are present with this name
+If a &"+"& prefix if used, all headers that are present with this name

 will be signed, and one signature added for a missing header with the
 name will be appended.
 
 will be signed, and one signature added for a missing header with the
 name will be appended.
 


@@ -40573,6 +40914,10 @@ Notes from the key record (tag n=).
 
 .vitem &%$dkim_key_length%&
 Number of bits in the key.
 
 .vitem &%$dkim_key_length%&
 Number of bits in the key.

+.new
+Valid only once the key is loaded, which is at the time the header signature
+is verified, which is after the body hash is.
+.wen

 
 Note that RFC 8301 says:
 .code
 
 Note that RFC 8301 says:
 .code


@@ -40580,9 +40925,8 @@ Verifiers MUST NOT consider signatures using RSA keys of
 less than 1024 bits as valid signatures.
 .endd
 
 less than 1024 bits as valid signatures.
 .endd
 

-To enforce this you must have a DKIM ACL which checks this variable
-and overwrites the &$dkim_verify_status$& variable as discussed above.
-As EC keys are much smaller, the check should only do this for RSA keys.
+This is enforced by the default setting for the &%dkim_verify_min_keysizes%&
+option.

 
 .endlist
 
 
 .endlist
 


@@ -40597,10 +40941,10 @@ verb to a group of domains or identities. For example:
 
 .code
 # Warn when Mail purportedly from GMail has no gmail signature
 
 .code
 # Warn when Mail purportedly from GMail has no gmail signature

-warn log_message = GMail sender without gmail.com DKIM signature
-     sender_domains = gmail.com
+warn sender_domains = gmail.com

      dkim_signers = gmail.com
      dkim_status = none
      dkim_signers = gmail.com
      dkim_status = none

+     log_message = GMail sender without gmail.com DKIM signature

 .endd
 
 Note that the above does not check for a total lack of DKIM signing;
 .endd
 
 Note that the above does not check for a total lack of DKIM signing;


@@ -40612,10 +40956,10 @@ results against the actual result of verification. This is typically used
 to restrict an ACL verb to a list of verification outcomes, for example:
 
 .code
 to restrict an ACL verb to a list of verification outcomes, for example:
 
 .code

-deny message = Mail from Paypal with invalid/missing signature
-     sender_domains = paypal.com:paypal.de
+deny sender_domains = paypal.com:paypal.de

      dkim_signers = paypal.com:paypal.de
      dkim_status = none:invalid:fail
      dkim_signers = paypal.com:paypal.de
      dkim_status = none:invalid:fail

+     message = Mail from Paypal with invalid/missing signature

 .endd
 
 The possible status keywords are: 'none','invalid','fail' and 'pass'. Please
 .endd
 
 The possible status keywords are: 'none','invalid','fail' and 'pass'. Please


@@ -40699,13 +41043,16 @@ deny spf = fail
      message = $sender_host_address is not allowed to send mail from \
                ${if def:sender_address_domain \
                     {$sender_address_domain}{$sender_helo_name}}.  \
      message = $sender_host_address is not allowed to send mail from \
                ${if def:sender_address_domain \
                     {$sender_address_domain}{$sender_helo_name}}.  \

-               Please see http://www.open-spf.org/Why?scope=\
-               ${if def:sender_address_domain {mfrom}{helo}};\
+               Please see http://www.open-spf.org/Why;\

                identity=${if def:sender_address_domain \
                              {$sender_address}{$sender_helo_name}};\
                ip=$sender_host_address
 .endd
 
                identity=${if def:sender_address_domain \
                              {$sender_address}{$sender_helo_name}};\
                ip=$sender_host_address
 .endd
 

+Note: The above mentioned URL may not be as helpful as expected. You are
+encouraged to replace the link with a link to a site with more
+explanations.
+

 When the spf condition has run, it sets up several expansion
 variables:
 
 When the spf condition has run, it sets up several expansion
 variables:
 


@@ -40740,8 +41087,13 @@ variables:
 
 .vitem &$spf_smtp_comment$&
 .vindex &$spf_smtp_comment$&
 
 .vitem &$spf_smtp_comment$&
 .vindex &$spf_smtp_comment$&

+.vindex &%spf_smtp_comment_template%&

   This contains a string that can be used in a SMTP response
   to the calling party. Useful for "fail".
   This contains a string that can be used in a SMTP response
   to the calling party. Useful for "fail".

+.new
+  The string is generated by the SPF library from the template configured in the main config
+  option &%spf_smtp_comment_template%&.
+.wen

 .endlist
 
 
 .endlist
 
 


@@ -41114,8 +41466,8 @@ A possible solution is:
   # Or do some kind of IP lookup in a flat file or database
   # LIMIT = ${lookup{$sender_host_address}iplsearch{/etc/exim/proxy_limits}}
 
   # Or do some kind of IP lookup in a flat file or database
   # LIMIT = ${lookup{$sender_host_address}iplsearch{/etc/exim/proxy_limits}}
 

-  defer   message        = Too many connections from this IP right now
-          ratelimit      = LIMIT / 5s / per_conn / strict
+  defer   ratelimit      = LIMIT / 5s / per_conn / strict
+          message        = Too many connections from this IP right now

 .endd
 
 
 .endd
 
 


@@ -41211,6 +41563,7 @@ requirement, upon libidn2.
 
 .section "MTA operations" SECTi18nMTA
 .cindex SMTPUTF8 "ESMTP option"
 
 .section "MTA operations" SECTi18nMTA
 .cindex SMTPUTF8 "ESMTP option"

+.cindex "ESMTP extensions" SMTPUTF8

 The main configuration option &%smtputf8_advertise_hosts%& specifies
 a host list.  If this matches the sending host and
 accept_8bitmime is true (the default) then the ESMTP option
 The main configuration option &%smtputf8_advertise_hosts%& specifies
 a host list.  If this matches the sending host and
 accept_8bitmime is true (the default) then the ESMTP option


@@ -41257,22 +41610,27 @@ may use the following modifier:
 control = utf8_downconvert
 control = utf8_downconvert/<value>
 .endd
 control = utf8_downconvert
 control = utf8_downconvert/<value>
 .endd

-This sets a flag requiring that addresses are converted to
-a-label form before smtp delivery, for use in a
-Message Submission Agent context.
+This sets a flag requiring that envelope addresses are converted to
+a-label form before smtp delivery.
+This is usually for use in a Message Submission Agent context,
+but could be used for any message.
+

 If a value is appended it may be:
 .display
 If a value is appended it may be:
 .display

-&`1  `& (default) mandatory downconversion
+&`1  `& mandatory downconversion

 &`0  `& no downconversion
 &`-1 `& if SMTPUTF8 not supported by destination host
 .endd
 &`0  `& no downconversion
 &`-1 `& if SMTPUTF8 not supported by destination host
 .endd

+If no value is given, 1 is used.

 
 If mua_wrapper is set, the utf8_downconvert control
 is initially set to -1.
 
 The smtp transport has an option &%utf8_downconvert%&.
 If set it must expand to one of the three values described above,
 
 If mua_wrapper is set, the utf8_downconvert control
 is initially set to -1.
 
 The smtp transport has an option &%utf8_downconvert%&.
 If set it must expand to one of the three values described above,

-and it overrides any previously set value.
+or an empty string.
+If non-empty it overrides value previously set
+(due to mua_wrapper or by an ACL control).

 
 
 There is no explicit support for VRFY and EXPN.
 
 
 There is no explicit support for VRFY and EXPN.